Free science fair topics software for linux

Derbrill Tutorials are Free Tutorials For Writing Games and Multimedia Applications in Runtime Revolution with ArcadeEngine.

The tutorials come in a visually appealing e-book format which is both easy to read and use, the range of topics covered includes:

* The basics of Revolution such as: stacks, cards, scripts, messages and timers
* How to use geometric properties such as distances, angles and intersection rectangles
* Understanding and using different movements including linear, polygonal, circular and elliptic
* Advanced use of images
* Using the built-in collision detection

Fair NAT is a script for configuring NAT on dedicated Linux routers. This is the home of my linux router shaper script which allows something like fair bandwidth sharing among clients in the local network. The script is not great or anything - please dont expect the holy grail here - I just thought Id publish it because many people helped me write it and maybe someone has some use for it. I bet there are still lots of things that can be improved. Sorry about the crappy design of this page, I dont have time to put more effort in better looks.
You have a certain number of Clients (User A - User N) in your LAN which are connected by a Switch (or a Hub or BNC) to the Linux Router which is supposed to act as a gateway to the internet. The trouble now is, User B has a lot of downloads running and User C uploads stuff day and night, which leaves User A who only wants to use an interactive SSH shell in the rain, since B and C already use up all bandwidth the internet connection offers.
What we need to do is to share available bandwidth fairly among clients. In order to achieve this, I first tried several searches at Google and Freshmeat. This turned up quite a lot of results, like the Linux Advanced Routing & Traffic Control HOWTO which is a must-read and also contains great scripts, like the Wondershaper for single users. Another great general purpose script I found was HTB.init, which doesnt do anything by default, but gives you an easy way to setup HTB queues. In case you prefer CBQ, theres a CBQ.init too. If you dont know what Im talking about, read the HOWTO above or continue reading here.
Since I never found a script that did exactly what I wanted, I decided to write my own. Its designed to be an all-I-need script, therefore it does not just setup Traffic Shaping, but Masquerading and Port Forwarding too. In short, it does everything that has to do with IPTables and Traffic Control. I use HTB (Hierarchical Token Bucket) to share bandwidth among clients (one class per client). On top of that I added a PRIO queue to prioritize interactive traffic on a per-user basis. On top of PRIO I set SFQ to treat connections fairly. In version 0.72, experimental support for IPP2P to recognize peer-to-peer traffic was added.
This is the simplified scheme for routing:
HTB class (for bandwidth sharing)
|
-- PRIO (for prioritizing interactive traffic)
|
--- Interactive: SFQ (to treat concurrent connections fairly)
--- Normal: SFQ
--- High-Traffic: SFQ
[ --- P2P: SFQ (if IPP2P support is enabled only) ]
I bet this can still be improved and Im always interested in ways to do so. In case you want another class structure, this can be done by replacing the parent_class and user_class functions in the script. See CLASS_MODE in Configuration section and the function documentation in the script for details. Feel free to send me your own functions with a short explanation, if you want me to make them available for everybody.
Heres a "real" graphic, which shows the complete qdisc/class structure on $DEV_LAN if you use the unmodified example configuration file. This graphic was created using a hacked version of Stef Coenes show.pl script and GraphViz. Click here to see it, but I warn you: its quite big. Heres a similar picture, which includes IPP2P support. Note that there are more filter rules (the blue arrows) now which put the filesharing traffic into the users prio band 4.
Main features:
- This is a variable with a space-separated list of features that should be enabled. Default is all enabled if you dont set this variable.
- PROC:
- Allow Fair NAT to change some system variables in /proc, like setting /proc/sys/net/ipv4/ip_forward to 1.
- MODULES:
- Try to load kernel modules for QoS first.
- RESET:
- Fair NAT will replace all existing iptables rules with a very basic (empty) configuration. Not healthy for firewalls. You can disable this feature to keep the original rules in place. See Firewall Support below.
- NAT:
- Allow Fair NAT to configure NAT. You could disable this if you prefer to set this up yourself / let your firewall do it.
- FORWARD:
- Allow Fair NAT to configure Port Forwarding. Same as NAT, you can disable this if you dont need it.
- QOS_DOWN:
- Shape download traffic. If you know a little bit about traffic shaping and believe that download shaping is completely useless, feel free to disable this.
- QOS_UP:
- Shaping upload traffic can be disabled also. If you disable this and QOS_DOWN also, you could use Fair NAT for setting up NAT and Port Forwarding only, although thats not really the purpose of the script ;-)
- TOS:
- Allow Fair NAT to modify the TOS (type-of-service) field of packets. Right now, Fair NAT relies on this TOS field for shaping, so using this feature is highly recommended.

SideRss is an rss feed reader in a sidebar format (just like desktop sidebars rss reader for window). Can take an unlimited number of feeds.

Autoscrolls or manually scrolls unlimited feeds
Shows 11 newest topics from each feed.
pops up a preview when topics are clicked.
clicking a preview will open firefox to the topic.
threading engine.
external config file via menu options

Originally based in part on blok, air_news and rssparser.

mysqlCart provides a template based dynamic e- commerce shop system.

It does not require any modules or rely on interpreted languages and is very fast even on older machines.

Finally a template driven -pure C with mySQL C API-, very fast and easy on your CPU and RAM GPL ecommerce solution. The mysqlCart/mysqlShop admin/dynamic site combo is from the world leaders in GPL ISP software OpenISP, and it is FREE (more so GPL free! www.fsf.org)

This ecommerce solution gives you the edge over clunky perl (shudder!) or pain in the ... php installation nightmare and interpreted lameness. And phps awkward syntax tries to be like C (php is written in C, but study its history and come to your own conclusions about its usefulness for heavy traffic sites,) so why bother?

To be fair php is great for certain things but C is much better for mySQL cgis. All unix type OSs, including Linux/FreeBSD/OpenBSD and Solaris are written in C.

Yet another Linux FAQ is a comprehensive FAQ about the Linux Operating System. Yet another Linux FAQ is a great document for Linux beginners to read.
This FAQ tries to help those new to Linux help themselves. It covers topics such as kernel recompilation and X Window System configuration.
Enhancements:
- The FAQ was completely redesigned, and dead links were cleaned up.

iFAQMaker provides a PHP class for easy maintenance of FAQs.
iFAQMaker is a PHP class for easy maintenance of FAQs, but it can be used for other things (like program documentation) as well. It is easy to use and works out of the box.
Main features:
- Inserting/Deleting/Moving single topics (within the same FAQ file) without the hazzle of reorganizing indices, numberings and links
- Use of templates to display the FAQ corresponding to the web site design
- Use of user-definable makros for frequently used formatings etc.
iFAQMaker needs no database or the like - it simply works with files. In general, we can distinguish between the program code, configuration, and content files. One central index.php file is the only one to be called within the browser.
It takes the topic to display as only argument, which is at the same time the basename of the content file to parse (without the extension): so
http://www.myserver.tld/faq/index.php?topic=faqmaker
parses the faqmaker.txt content file and displays it according to your setup.

ASCEND is a flexible modelling environment for solving hard engineering and science problems. It offers:
- an object-oriented model description language for describing your system,
- an interactive user interface that allows you to solve your model and explore the effect of changing the model parameters, and
- a scripting environment that allows you to automate your more complex simulation problems.
The project was originally written at Carnegie Mellon University in the 1980s and includes powerful and reliable solver routines that analyse the structure of your model and can solve thousands of simultaneous nonlinear equations in a few seconds on everyday computer hardware. It is under active development and is licensed under the GNU General Public License ensuring that it is free software and will remain free.