Free mainly a cappella software for linux

mailvisa is a bayesian spam filter, inspired by Paul Grahams A Plan For Spam. It is mainly intended for my own expirimentation, but provided here for those who are interested.
It is competitive with other bayesian filters in terms of accuracy and speed. The system is written in Ruby.
You can use, modify, and distribute mailvisa under the terms of the MIT License.
Enhancements:
- A man page has been added.

Emilda is an Integrated Library System that features an OPAC, circulation and administration functions, Z39.50 capabilities, and 100% MARC compatibility.

MARC compatibility is achieved using the Zebra server from Indexdata in conjunction with MySQL. Emilda is mainly written in PHP, but Perl scripts exist for MARC manipulation and shell interaction.

Linux documentation can be found in man pages, info files, HOWTOs and FAQs, and elsewhere. (For example, also the kernel Documentation directory contains a lot of good stuff.) A nice index for the man pages in Fedora Core 2 is found at the superman site.

Man pages belonging to programs are usually distributed together with those programs. Therefore, the Linux man-pages distribution mainly contains the pages for system calls and library routines, special devices, and file formats.

However, it also contains documentation for a number of programs, in cases where the authors or maintainers of the program do not distribute man pages themselves.

Raine is a M68000 and M68020 arcade game emulator.

Raine is an emulator, it emulates some M68000 and M68020 arcade games and is mainly focused on Taito and Jaleco games hardware.

It started as an experiment with the Rainbow Islands romset, dumped by Aracorn/Romlist. Raine can emulate many nice games now, and new games (previously unemulated) are appearing weekly.

Sound is also getting better, mainly thanks to the work of Hiromitsu Shioya

Vocab+ is basically an English Vocabulary building software, for the UNIX environment. Features include adding/deleting/editing/searching words, and an extensive set of randomized and controllable tests of vocabulary.

VocabPlus is very useful for those who are mainly working in the UNIX environment, and who love to work with software in the keyboard mode. It is a very robust, useful and user-friendly software.

It supports colorful displays and interfaces, while still being completely text (non-graphical) based. It is free software, protected under the GNU General Public License.

Dry Brush Plug-In is a plug-in like a tool in Gimp.

It mainly tries to express a feeling of a drawing materials with strength that is brought by pressure sensor of a tablet.

TRIPP is a utility to rewrite incoming and outgoing IP packets. Since it can rewrite both headers and payload, it can be used to configure the tcp/ip stack behavior in order to perform various tasks mainly intended for network tests, simulations and development.

It is configured via a small rule-based language, which allows the user to intercept packets, set arbitrary header values, increment or decrement numeric header fields, set an arbitrary payload, rewrite parts of the payload, or fragment, multiply, or drop packets.

TRIPP project is totally user-level and doesnt require any kernel module.