Free brain twisters software for linux

MersenneTwister is a C++ class for generating random numbers. It was designed with consideration of the flaws in various other generators.
The period, 2^19937-1, and the order of equidistribution, 623 dimensions, are far greater. The generator is also fast; it avoids multiplication and division, and it benefits from caches and pipelines. See the inventors page for more details.
I have implemented the Mersenne Twister in a C++ class that is fast, convenient, portable, and free. Take a look at the class or download the complete package in zip or tarball format.
Main features:
- Simple creation of generator with MTRand r;
- Convenient access with double a = r();
- Generation of integers or floating-point numbers
- Easy seeding options
- Automatically from /dev/urandom or time() and clock()
- Single integer
- Arrays of any length (to access full 19937-bit range)
- Ability to save and restore state
- Thorough example program
- Validation and performance tests
- Open source code under BSD license
On my system, a Pentium III running Linux at 500 MHz, the performance test gives the following results for generation of random integers:
MersenneTwister.h 28.4 million per second
Inventors C version 14.3 million per second
Cokuss optimized C version 16.6 million per second
Standard rand() 6.8 million per second

Mantissa is a collection of various mathematical tools aimed towards for simulation.
Mantissa contains a collection of algorithms, among which:
a small set of linear algebra classes
a least squares estimator
some curve fitting classes
several ordinary differentials equations integrators, either with fixed steps or adaptive stepsize control (see below)
vectors and rotations in a three dimensional space
algebra-related classes like rational and double polynomials
various orthogonal polynomials:
Chebyshev
Hermite
Laguerre
Legendre
some random numbers and vectors generation classes:
Robert M. Ziff four tap shift register (contributed by Bill Maier)
Makoto Matsumoto and Takuji Nishimura Mersenne twister
generators for vectors with correlated components
some basic (min, max, mean, standard deviation) statistical analysis classes
some optimization algorithms using direct search methods:
the Nelder-Mead simplex method
Virginia Torczons multi-directional method
Enhancements:
- For many basic objects provided by Mantissa like Vector3D, Rotation, and the various Polynomial classes, instances are now guaranteed to be immutable.
- This greatly simplifies safe sharing of instances without forcing users to either put severe restrictions on their use of Mantissa classes or make numerous copies just to make sure everything is safe.
- Since the change is a semantic change on the contract of the classes, this version introduces some incompatibilities with respect to previous ones.
- Upgrading to this version is not difficult, though.

SBaGen generates sounds that give an altered state of consciousness. The theory behind binaural beats is that if you apply slightly different frequency sine waves to each ear, a beating affect is created in the brain itself, due to the brains internal wiring.
If, in the presence of these tones, you relax and let your mind go, your mind will naturally synchronize with the beat frequency. In this way it is possible to tune the frequency of your brain waves to particular frequencies that you have selected, using of the four bands: Delta: deep sleep, Theta: dreaming and intuitive stuff, Alpha: awake, focussed inside, and Beta: awake, focussed outside.
It is also possible to produce mixtures of brain waves of different frequencies by mixing binaural tones, and in this way, with practice and experimentation, it is reportedly possible to achieve rather unusual states, such as out-of-body stuff, and more. See the books by Ken Eagle Feather, and the Monroe Institute site for more details. The Monroe Institute have apparently put 40 years of research into these techniques.
Centerpointe have also done a great deal of research into binaural beats, concentrating more on improving overall well-being and holistic functioning rather than reaching unusual states, and I recommend reading some of the articles on their site (look under "Site Map", for example their Special Report: "How The Holosync Technology Works" and their FAQ).
I should add that I have only read about the more advanced and unusual uses (OOBEs and so on). My own experiences have not reached quite that far, but still I feel that I have benefitted immensely from using these techniques over the last few years: from simply getting my head clear in confusing moments, to the energy boosts that come at times, to more general emotional clearing, and occasional very intense dreams (although not quite lucid).
So, SBAGEN is my utility, released as free software (under the GNU General Public Licence) for Linux, Windows, DOS and Mac OS X, that generates binaural tones in real-time according to a 24-hour programmed sequence read from a file. It can also be used to play a sequence on demand, rather than according to the clock, or to write a WAV file for playing later. Pink noise, MP3 and Ogg files (since version 1.2.0) may also be mixed with the binaural beats to provide background sounds. (Two files of randomly-looping river sounds are provided from version 1.4.0 onwards). This tool is ideal for anyone who wishes to experiment with these techniques and do research into this for themselves. (For those who would rather pay for a pre-packaged programme with support, I recommend taking a look at the Centerpointe site -- and see my disclaimer)
My original idea was to use this utility to play a programme of different tones throughout the night, hoping to improve dreaming and dream-recall, and then to bring myself up into Alpha rhythms to (hopefully) make a good start to the day. I am now using it more for shorter focussed sessions of about an hour, both during daytime and at night. However, other people have used this software in many different ways. For example, one person suffering constant pain from historical injuries appreciated the way that he could tune the frequencies very accurately to his needs to help him sleep better at night. Other more unusual uses have included: mixing the sounds in as part of musical compositions, and generating ambient sounds during live DJ sets or trance music.
Enhancements:
- Fixed problem when playing 7+ hour sequences with -SE or -L
- Warns properly if the WAV file limit of ~7 hours is exceeded, and truncates

Scrinchy is a tiny HTTP multitasking webserver that I wrote for my own purposes, but which is also a fitting response to the now fairly bloated Apache.
Its name derives from an obscure English verb "to scrinch" which generally means to willfully compress a thing which is not very large into a smaller size. For instance "to scrinch your eyes". This is apt, because Scrinchy is a project where the goal is constantly to make it smaller but yet as feature-rich as possible.
Scrinchy is capable of serving HTML, JPG, GIF, TIFF, PNG, and various other file types, as well as running Perl, Python and (theoretically) PHP scripts externally and passing GET params and cookies to those scripts. At this stage, Scrinchy does not support POST but it will later.
Scrinchy also has some anti-hacker features, described in the README file. The more I use the server myself and observe all the hair-brained things attackers and infected computers do, the more amusement I find in squashing their pitiful efforts.
Enhancements:
- This release improves the internal stack-based interpretive language.

ChangeBlindness project is a puzzle game that demonstrates the change blindness phenomenon.
The effect shows that our brains have low level change detection that is subconscious and that can be disabled pretty easily (for instance with a flicker).
Main features:
- Increasing difficulty levels
- Skinable
- The software was not developed with software engineering in mind, but still sports some nice features (Logging, Preference Store, Model/View-Separation, nsis-Installer-Skripts).
- High-Score

PWP Wiki Processor is a PHP Wiki based on flat files that can create static pages.
It uses flat files as data storage, no database is required.
It has a simple cache and trash bin, and can handle file uploads.
It is able to export its contents into static HTML pages.
A Wiki is a community/collaboration tool enabling a group of authors to create a network of linked HTML pages.
Main features:
- The various text formatting rules are described on a separate page: TextRules
- PWP uses flat files to maintain the data, no database is required. Every page is one data file in the data directory. The page still contains Wiki code; HTML is created at the moment of delivery. (You can translate Wiki code into HTML but not re-translate HTML into Wiki code.)
- The file upload page lets you store additional content at your website. Upload images or other documents and link them from your Wiki files.
- Every erase operation stores the Wiki pages or uploaded files in a trash bin. If your fingers were faster than the brain, simply unerase the file from the trash bin! You can delete files from the trash physically after a certain period of time (config entry). You can view files in the trash, but not edit these files.
- PWP supports a revision history. While editing a page you decide whether your changes are big enough to create a new revision. You can view and restore the old revisions of a file. Uploaded files will also be stored in the revision history if a new file with the same name gets uploaded again. To keep the history lean, you can delete all files older than a certain period of time (config entry).
- You can view recent changes, i.e. all recently changed pages and uploaded files.
- New in 1.5.0 Now PWP offers a diff. Further, it allows to rename and copy Wiki pages.
- You can configure the number of columns and rows in list views.
- Lost some information? Now you will have to do a full text search. PWP searches in both areas, in Wiki pages and in uploaded text files! The full text search is really simple without any indexes and might become slow if your Wiki contains several hundred pages. Well, hardware speed is increasing fast and time is working for me...
- PWP supports backlinks: A list of all pages which link to the current page. PWP can also trace backlinks for uploaded files. The search for backlinks is done on the fly without indexes or similar mechanisms.
- A search for file names is available. You can type fragments like ag and a list with all matching files is presented: Page2, Age. Search searches both, the Wiki pages and the uploaded files.
- New in 1.5.0 Reports are generated Wiki pages which help you to organise your information. Available are a hierarchical table of contents, a keyword index and a trail map / teaser text report.
- A simple click on a link will generate monthly calendar pages and an annual overview. The calendar supports either the German (European?) week format or the US week format where weeks start on Sundays.
- PWP can create a table of contents at the top of each page, consisting of all H1 and H2 tags.
- Concurrent editing? With page locks! Any edit action will set a page lock which warns other editors. The lock can be forced off.
- QuickEdit lets you view a page and append, insert or prepend new text in an edit box directly on the page. (Insert requires a special editor comment: ! --(+)-- ! )
- A simple cache will speed up your operations. Changed in 1.5.0 It stores lists and search results, but not Wiki pages.
- Snippets are supported. Snippets are text fragments, which will be appended to the end of the edit box on a simple mouse click. See /wiki/conf/Snippets.inc.
- The whole appearance (colours, fonts) is controlled by a simple style sheet (CSS). You can now add your own style sheet in second place, overwriting the default settings.
- If configured, the web pages are delivered as zipped data stream, making the Wiki faster on the internet.
- Save the best thing for last: PWP can export static web pages with a different header and footer. All links on these static pages will point to HTML pages, not to a PHP script. The static files are combined with a snapshot of the uploaded files. PWP can delete and re-create only outdated static pages. This feature will speed up the process but might result in dead links if there is no full update of the static contents from time to time.
Enhancements:
- added: Recent changes report
- changed: Report sorting now available for almost all reports
- changed: Keyword index report offers invers mapping
- fixed: WikiEngine issues with mail addresses and static links
- removed: Collisions, locks should be sufficient
- changed: Minor other changes, some refactoring.

DTI stands for Diffusion Tensor Imaging and is a magnetic resonance imaging method that can be used to measure local information about the structure of white matter pathways within the human brain. Combining DTI data with the computational methods of MR tractography, neuroscientists can estimate the locations and sizes of nerve bundles (white matter pathways) that course through the human brain. DTI-Query allows neuroscientists to place and interactively manipulate box-shaped regions (or volumes of interest) to selectively display pathways that pass through specc anatomical areas.
Enhancements:
- Improved support for tensor data formats. (Now supports 5D tensor files, and arbitrary ordering of tensor indices.) Has been tested with tensor image files output by the AFNI tools: http://afni.nimh.nih.gov/sscc/dglen/DTIQuery
- Support for Mac OS X (Carbon)
- Binaries released for Windows, Linux (32- and 64-bit), and MacOS X (PPC and Intel)
- Added choice of integration method (Eulers method, Runge Kutta 2nd order, Runge Kutta 4th order) for STT tracking.
- Improved support for reading NIFTI background images (correctly handles q-form/s-form matrices).
- Can now save visible pathways (as a binary format, or as a NIFTI mask image).
- Many minor GUI enhancements and bug-fixes.