Free in multiple software for linux

Multiple Time Sheets is a simple tool to help you keep track of how many hours you work and for whom.
It differs from most time-tracking software because its designed to work like paper that magically totals up hours.
Main features:
- Uses text files, requiring no database.
- Supports only one user per app, for simpler code.
- Sends and tracks invoices, and payments thereof.
- Features a rudimentary to-do list that displays your list as an outline.
- Sends you a backup of your data automatically.
- Assume the user prefers free-form data entry in text files rather than typing into forms.
- Uses the htmlMimeMail.php class by Richard Heye (phpguru.org).
- CSV and OPML exports of some data.
- Automatic hyperlinking from MTS to your favorite web-based software.
Enhancements:
- This release added a feature that replaces text patterns with links so that strings like "Bug 10" can link to a bug tracking application.
- CSV export was added for the timesheet along with OPML export for the to-do list.

FireMule is a Firefox extension that allows you to add multiple downloads to eMule/eDonkey2000.

It is able to add all of the ed2k:// links from a page or add only selected ed2k:// links.

SimplePBX is a configuration/dial plan manager for Asterisk. Supports multiple trunks and call groups. This is a Multi-Tenant system requiring very little configuration to have a fully working PBX system. Complete GPL source code.

ibrouteur is a Web-based photo gallery software. The image repository is parsed into a database used for querying.

Queries are done via the URLs, and the system offers multiple indexes for efficient browsing.

talkative project is a simple XMPP/Jabber client. It is written in Mono/C# and uses GTK+ GUI toolkit. It is designed to interoperate well with GNOME desktop environment.
Main features:
- Chats & Messages
- Support for multiple accounts
- Avatars

Rubyripper is a secure audio-cd ripper for linux.

Through multiple times ripping the same track and correcting any differences Rubyripper tries to deliver a secure rip.

The MPFR library is a C library for multiple-precision floating-point computations with exact rounding (also called correct rounding). It is based on the GMP multiple-precision library.

The main goal of MPFR is to provide a library for multiple-precision floating-point computation which is both efficient and has a well-defined semantics. It copies the good ideas from the ANSI/IEEE-754 standard for double-precision floating-point arithmetic (53-bit mantissa).

MPFR is free. It is distributed under the GNU Lesser General Public License (GNU Lesser GPL). The library has been registered in France by the Agence de Protection des Programmes under the number IDDN FR 001 120020 00 R P 2000 000 10800, on 15 March 2000.

This license guarantees your freedom to share and change MPFR, to make sure MPFR is free for all its users. Unlike the ordinary General Public License, the Lesser GPL enables developers of non-free programs to use MPFR in their programs. If you have written a new function for MPFR or improved an existing one, please share your work!

Palabre is an open source (and free as in free beer) XML Socket Python Server.
It is meant to be used in replacement (for example) of the Macromedia Flash Communication Server. (which is lets admit it really expensive)
Of course, its much more limited, but has all the basic functionnalities for connecting Flash based Clients through Xml Sockets (sending and receiving messages).
So you can use it to create, multiuser applications like a Chat, (almost) Real Time Flash Games, Online support, ...
It does not include Video streaming functions ( FLV via RTMP ) instead of Flash Communication Server.
Main features:
- Have multiple Rooms
- Each Room can have any parameter you want ( A title, a lock, operators, any flag, ...)
- The creator of the room can change this parameters
- The room can have Sub rooms (or child rooms)
- For Example, you can host 10 games and chats on a server, and each game has a lobby room for chatting, and as many subrooms as wanted. Players can chat, start a new game, wait for people to join, and then start the game. (Then the child room of the game can be "locked" so that no one else joins it.
- Have multiple clients
- They are identified by a nickname (like on IRC)
- One client can be in multiple rooms / subrooms
- Clients can send messages to a room
- Clients can send messages to other clients (private messages)
- Clients can send a broadcast message (or reserve this to root)
- Clients can ping the server
- Clients can ask for a "room message" to be sent back to them. (to test latency, ...)
Enhancements:
- Database identification support (< connect nickname="X" password="Y" / >)
- Clients params (< clientparam name="X" value="Y" / >)
- SubXML nodes : (< msg toroom="X" >< position >< x >12< /x >< /position >< /msg >)
- Customizable nodes (< mynode toroom="X" anyparam="Y" >< AnyContent >< /mynode >)
- Joined/Left information (< client name="Nickname" joined="Lobby" / >)