Free from being software for mac

Danger from the Deep (known as dangerdeep or DftD) is a free (as in free speech), Open Source World War II german submarine simulator.
Danger from the Deep and source code is available under the GPL license and most of the artwork/data is released under a Creative Commons license (Attribution/NonCommercial/Non-Derivative works).
DftD is currently being developed on Linux (i386 and AMD64) and Windows. There are binarys available for Linux (i386 and amd64), Windows (32bit) and there are some old packages for MacOSX.
Danger from the Deep is a program that makes use of SDL/OpenGL and thus should be portable to other operating systems or platforms.
Danger from the Deep is planned as tactical simulation and will be as realistic as our time and knowledge of physics allows. Its current state is ALPHA, but it is playable. If anyone wants to contribute in development, youre welcome, just email the dangerdeep-devel mailing list. Contributing binary packages for various Linux distributions would also be much appreciated.
Main features:
- Simple menu system
- Clean user interface (still being updated)
- Basic world simulation; Night and day etc.
- Realistic water and cloud simulation
- Different classes of ships; Destroyers, Battleships, Merchant ships etc.
- Steering, firing, diving, periscope (all the basics)
- Free look engine for testing, periscope, UZO (aiming binoculars), bridge view
- Console for logging purposes
- Basic physics
- Basic destroyer AI
- Vehicle/ship preview
- Support for custom missions
- Tonnage recording
- Log book

Requirements:
FileMaker Pro 10 or FileMaker Pro 10 Advanced.

MGI is a plug-in to WebSTAR with server side includes, send mail, forms processing, guestbook, authentication, banner ad, database, and E-commerce functionality along with many other goodies.

Some features include:Disallowing pages from being served by caching mechanisms which facilitates the end-user experience particularly involving pages which are dynamically served.

Full and correct support for cookies, eliminating problems with some versions of Internet Explorer in accepting and returning cookies.The addition of mgiAbort to facilitate debugging of MGI tag insertions.The Demo will run for two straight hours.

Aero Fox 3.5 provides great and popular theme which has been downloaded many times on the Firefox Add-ons site for the past two years. It is designed for users of Windows Vista but it looks great on Mac and Linux as well.

MI-SUGAR (pronounced "my sugar") is a lightweight electrical circuit analysis environment which uses the free simulators SPICE and Gnucap. You can create analog circuits using the schematic entry tool or the netlist editor, then run the simulation and analyse the results in the graph plotter. MI-SUGAR supports subcircuits with which users can build their own library of elements. I am not developing MI-SUGAR anymore. The source code is available.
Main features:
- The schematic tool supports scaling and panning, allows unlimited undos, exports to SVG (Scalable Vector Graphics), and converts the schematic to netlist.
- The netlist command lines are colored for better readability.
- Custom subcircuits can be created.
- Multiple circuits can be simulated at the same time.
- Simulation data can be exported to MATLAB or MathML file formats.
- The plotter supports logarithmic scaling and zooming.
Enhancements:
- Added "Fit to View" button, removed "Home" button
- Fixed bug, which prevented node number from being seen
- Modified executable type to support Macs with Intel processors
- Other minor bug fixes and modifications.

Wapp pro is the ultimate windows/applications switcher.
It displays a menu that lists the windows of the frontmost applications, the background applications and their respective windows in submenus. You can activate any window, even its hidden by several other windows, or if the process is hidden. The Finder windows also display their content in submenus up to 5 levels.
It lets you quit, or hide any application, quit all the applications, or hide them all. You can also exclude some applications from being quitted or hidden by these commands, like for example SpeedDoubler that you dont want to quit, or QuickTime player that you dont want to hide...
Wapp pro lets you also navigate through the windows of the front process with keyboard shortcuts. You can exchange the 2 frontmost windows, send the frontmost window to the back, or bring the last window to the front. It also lets you cycle through the applications list.
Enhancements:
- Now Wapp pro only keeps track of applications visibility on Mac OS 9.1 or newer due to a big incompatibility with 9.0.x
- Corrected a problem when dragging an alias onto an applications icon in the menubar.
- Some computers didnt properly go into automatic sleep-mode since version 3.5. Fixed.
- Packaged applications (Illustrator 10, Photoshop 7, AppleWorks 6.2......) can be chosen in the exclusion lists.

jscl-meditor aims to provide a free and open source Java symbolic computing library with a mathematical editor front-end. There are several computer algebra systems available on the market, most of them developed in other languages, mainly C/C++ and Lisp.
But the benefits of using java in symbolic computation are great. Aside from being widely used and to comply with various standards, this language has two features of concern : readability and portability.

The symbolic capabilities are currently:
- polynomial system solving
- vectors and matrices
- factorization
- derivatives
- integrals (rational functions)
- boolean algebra
- simplification
- geometric algebra
- java code generation
- graphical rendering of math expressions
NOTE: jscl-meditor is licensed and distributed under the terms of the GNU Library or Lesser General Public License (LGPL).

System requirements:
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Enhancements
- send to/paste from twitter action