Free multi user software for linux

Manipulate is a BASH script that allows a user to easily and quickly administer a server. Manipulate currently supports.
Be warned, Manipulate is still very much in beta stage, use with extreme caution! I have not discovered any bugs (other than those I have fixed) so far, but you should be wary.
Enhancements:
- the adding, editing and removing of system users
- Control of SSH, FTP and HTTP Daemons
- Administering a Remote System
- Editing HTML files on the server
- Disk Quota Administration
- Remote Database of users
- A Multi-user program with configurable access rights
- Web server backup creation and restoration
- Installation of necessary files on a remote server (Where needed)
- Ability to use Text to Speech Synthesis made optional
- Online update functionality
- Lower memory usage than Version 0.1
- Ability to restart server

Distributed Multi-User Compilation System is a system that allows a group of users to share a compilation farm. Each compilation request from each user will be sent to the fastest available machine, every time.
Main features:
- Supports multiple users compiling simultaneously, and scales well to handle the new loads.
- Supports multiple operating systems in the compilation farm.
- Uses all processors of a multi-processor compilation host.
- Makes best use of compilation hosts with widely differing CPU speeds.
- Guarantees that a compilation host will not be overloaded by compilations.
- Takes into account the load on a host caused by non-compilation tasks.
- Supports the dynamic addition and removal of hosts to the compilation farm.
- Works with distcc, which need not be altered in any way.
DMUCS consists of these (main) programs:
- dmucs: the "host-server". This application reads a configuration file indicating the number of CPUs and the "power" of each potential host in the compilation farm. It then receives over the network:
- load average information from each compilation host.
- host requests from compile tasks that need remote hosts on which to run.
- information requests from monitoring applications.
- status requests from an administrator.
- dmucs maintains the database of hosts in the compilation farm, and assigns hosts to compilation tasks, giving out the best host/cpu available when the compilation task asks.
- gethost: a compilation task uses gethost get a host/cpu from the dmucs server. In general, a makefile will perform a compilation this way:
- gethost distcc gcc ...
- gethost contacts the server to get a host, which it puts into the environment variable DISTCC_HOSTS. gethost then calls the program given to it. After that program ends, gethost releases the assigned host back to the dmucs server.
- loadavg: the administrator of the compilation farm must start this application on each compilation host. loadavg sends the load average of the compilation host to the dmucs server periodically. The dmucs server will "downgrade" a compilation host if the hosts load averages goes too high.
- monitor: the administrator (or anyone) may use this program to monitor the busy-ness of the compilation farm. It displays which hosts/cpus are available in the compilation farm, which hosts/cpus have compilation tasks assigned to them, which hosts have been made administratively unavailable, and which hosts are "silent" - i.e., the dmucs server has not received a load average message from the compilation host for a while.

TinyMUSH 3 project is a descendant of the TinyMUD server, and thus supports multi-user communication in a text-based "virtual world" format, via TCP/IP connections (presumably, but not necessarily, Internet connections).
The end result looks much like text adventures games of the mid-1980s. Though its simplest application is as a chat server, TinyMUSH 3 is intended to have the flexibility and power to support highly complex roleplaying environments.
TinyMUSH 3 is a derivative of TinyMUSH 2.0, originally created through the fusion of the TinyMUSH 2.2 and TinyMUX 1.6 code branches. The server is under active development and support.
Enhancements:
- Fixed Always clear @prog data on logout
- Fixed tools (src/tools). Add an install tag to the tools makefile.
- Update LibTools to version 1.5.22.
- Update AutoConf to version 2.59.
- Fixed function logf() in udb_* conflict with build-in function logf(), rename the function to warning().
- Remove unused port-concentrator code.
- Automated build of TinyGDBM within ./configure.
- Updated the build process a bit to keep in line with autoconf standards.

Tina POS is a point of sales application designed for touch screens.

Tina POS supports ESC/POS ticket printers, customer displays, and barcode readers.

Its multi-user and has a great backoffice with a product entry form, reports, and charts.

Online Turnbased Wargame is a multi-user war game with multi-layer delegation. Logistics, production, and technology development is included. Creation of maps, scenarios, campaigns, Orders of Battle, and Tables of Equipment is also included in the scope
Enhancements:
- This release completes the move from a stand-alone application to being integrated as a plugin for the e107 CMS.
- Development will continue in this framework.

Minnow is a Web-based PDF discussion engine for discussing and annotating documents in an online, multi-user environment.
Minnow was developed by the Mathematical Biology group at the Northwest Fisheries Science Center in Seattle, WA with support by NOAA/NMFS.
Enhancements:
- This release includes some major updates such as full-text extraction from PDFs, edit-in-place support for editing titles and descriptions of documents after theyve been imported, a progress meter for converting large PDFs to images, and user-level access control, allowing you to specify which users can view a document.