Free rare purple pearl software for linux

parp is a powerful, extensible e-mail filter with sophisticated anti-spam capabilities. Its made as a complete replacement for procmail, is MIME-aware, and acts as a filter, daemon, or on mailboxes.
This was yet another personal itch which needed scratching. I receive between 5 and 20 spam e-mails most days. It wasnt only mildly annoying to have to hit delete more than normal, but I also forward all e-mail which ends up in my main inbox to my mobile (cell) phone via email2sms and an Internet/SMS gateway, and I was sick to death of my phone bleeping a lot through the day purely due to junk mail.
I started looking at all the available anti-spam filters. Over a period of two years, I looked at many, including the NAGS filter, despam, various complex anti-spam procmailrcs, the spamometer, blackmail, filter.plx, zfilter, spamstop, junkfilter ... but various things put me off all of them:
Some werent written in Perl. Call me a Perl bigot, but if there was ever a case of Perl being the right tool for the job, its an e-mail filter. Extensibility and maintainability were very high on my list.
Some were terribly coded. I refuse to put my e-mail at the mercies of bad code (and that includes sendmail ;-).
Some insisted that you use a particular MDA or MUA. I have no intentions of changing from mutt and qmail.
Many filtered on only the headers, or only the body. I want to filter on both, not all the time, but in some circumstances.
None were as accurate as I wanted. My goal was at least 99% accuracy. (At the time of writing, parps accuracy is hovering around the 99.8% mark.)
Main features:
- Can act as a filter in a similar manner to procmail, or directly on files in Mbox format (and possibly other formats via Mail::Box - untested), or as a daemon processing mails from a spool. In the latter case, mails are injected into the queue via a tiny (15k on my system) executable which handles locking correctly.
- Standard filtering actions are available (deliver to mailbox, pipe to command, reject as junk etc.)
- Highly sophisticated spam detection heuristics: currently around 40 different tests performed in a worst case scenario, although all tests optimised for speed (e.g. fast tests performed on headers, then slower tests only performed on body if necessary). N.B. Im considering incorporating the SpamAssassin ruleset at some point too.
- Optional cross-checking with the Open Relay Database.
- Filter adds X-Parp-Accepted: and X-Parp-Rejected: headers so that you can easily monitor its filtering strategy without leaving your mail reader.
- MIME multi-part aware, e.g. will not be confused by binary attachments.
- Berkeley DB format friends database, for keeping false positives to an absolute minimum.
- Automatic extraction of addresses into the friends database from emails which pass the spam tests. Semi-automatic removal of addresses from the friends database on the rare occasions parp gets it wrong. The friends database is also easily editable with my dbm utility.
- Other `grace tests allowing bona fide persons communications through (e.g. passworded e-mails) just in case all the other tests go badly wrong.
- The configuration files are written in raw Perl, so you can extend the filter arbitrarily using the main programs API.
- Comprehensive logging and error-trapping systems.
- Auxiliary program to print out comprehensive statistics on all aspects of filtering (see the sample output).
- Ability to log false positives/negatives when spam detection has gone wrong in a way which can be interpreted by the statistics program to determine the filters current accuracy of spam detection.
- Mostly RFC822-compliant state machine parser of Received headers, enabling extensive spam trace analysis and retaliative action. Read its man page or source if youre curious.
- Duplicate removals (by message id).
- Emails which have already been filtered can be used as regression tests, to easily spot problems when you make changes to your filtering logic.
Version restrictions:
- Limited documentation so far. This is gradually improving.
- Requires some knowledge of Perl / programming. (Ironically, if it didnt, there would be far greater limitations to the filters flexibility.)

PowerDNS project has developed a complete suite of technologies surrounding Internet Naming and email.
Internet Naming is at the core of all online activities and is involved in each and every transaction on the net. Email remains the killer application of the Internet.
Enhancements:
- This release contains two important security fixes, which should also solve the very rare reports of stability problems.
- Additionally, a new class of misconfigured domains will now always be resolved correctly, instead of intermittently.

Biomolecule Toolkit project is an Open Source library for the structural modeling of biological macromolecules. The toolkit provides a C++ interface for common tasks in computational structural biology, to facilitate the development of molecular modeling, design, and analysis tools.
Enhancements:
Documentation updates
- Addition of an extensive discussion of the leastsquares_superposition and RMSD-calculation methods, including a description of the mathematical theory behind their operation.
- Fully documented the rotation/translation methods
- Addition of a documented example program ("gyration_radius.cpp")
Bug fixes
- Fixed copy construction bug in PDBAtomDecorator that caused compilation errors in rare situations.
- Fixed a bug in PDBFileParser that caused a compilation error in the PDBSystem copy constructor.
- Fixed a const-conversion bug in GroupedElementIterator which prevented proper interoperation of const and non-const iterator types.
- Fixed a crash-producing bug in stream output for the TypeID class.
- Fixed a math error in RMSD and superposition methods that would corrupt molecule coordinates.
- Fixed a bug that caused all default-constructed PDBAtom objects to be treated as HETATMs.
Feature additions
- Added operator[] to AtomicStructure and PolymerStructure-derived classes.
- Added protected increment() and decrement() operators to TypeID class.
- PDBFileParser can now handle PDB files with ill-formed residue numbering (i.e. Files where residue numbers are repeated in successive chains).

Solar Visitor is a space simulator where the user flies around our Solar System in a 3D view. The program and source code are offered free, there are builds for Windows and Linux. Solar Visitor uses the Ogre graphics library. The planets and objects were created with the Blender program.
Because Solar Visitor is a 3D program, performance depends on the capabilities of the users video system.
If you wish you may build from source using available tools but be warned this is not an easy task. An addition to Ogre a compiler and IDE (on Windows) are required. The Ogre web site has installation instructions for its use. Those without c/c++ experience will find themselves jumping in the deep end.
With the release of version 0.2.x the user can view planets rendered from textures which is a vast improvement over the painted colours of 0.1.0. There is still realism to add. For instance, the orbits are engineered to showcase shadow effects and not be realistic, where eclipses are rare.
The program code is released under the GPL, the media are generated from downloadable images on the web, details of location are provided. Images remain the property of respective owners.
Enhancements:
- bugfixes
- tilted orbits