Free scalable software for linux

Scalable OpenGroupware.org (SOGo in short) is a groupware server built around OpenGroupware.org (OGo) and the SOPE application server.
We are constantly improving functionnalities and the user experience. So far, we improved the user interface to use AJAX and we focused on the integration of the Mozilla suite (Thunderbird, Sunbird/Lightning).
We also added CalDAV support so that any calendaring application which uses this standard protocol can now communicate with SOGo.
Main features:
- Complete redesign of the user-interface to give SOGo a look and feel similar to the Mozilla Thunderbird and Sunbird applications
- Calendar and address book sharing
- Mutiple address books and LDAP-based address books
- Concept of tasks
- Contacts in vCard
- Integration with the Mozilla application suite
Enhancements:
- A superuser can be defined.
- The raw message source can be viewed.
- Compatibility was checked with PostgreSQL 8.2.
- The menus of the Web date selector would no longer appear.
- An SQL constraint violation would prevent task entries from being recorded.
- The due date in tasks was incorrectly set.
- It was impossible to empty the start and the due date in the task editor from the moment they were set.
- IMAP folders with non-ASCII characters can now be accessed.
- The quotas of the selected mailbox are displayed (if available).
- Users were prevented from accessing shared resources in DAV.

The Sambar Server is an open and scalable framework that provides an intuitive, secure and personalizable environment for end-users; rapid development and deployment tools for developers; and an easy-to-use console for administrators.
Main features:
- WebDAV
- Content Management
- Document Versioning
- Search Engine
- Mail Server
- Servlet Runner
- Usage Throttling
- CRON Daemon
- IRC Server
- FTP Server
- TFTP Server
- DNS Server
- DHCP Server
- Proxy Server
- Socks Proxy
- Reverse Proxy

Citadel is an advanced messaging and collaboration system for groupware and BBS applications. Users can connect to Citadel using any telnet, WWW, or client software.
Among the features supported are public and private message bases (rooms), electronic mail, real-time chat, paging, shared calendaring, address books, mailing lists, and more.
Unlike other collaboration servers, Citadel provides its own data stores and is therefore extremely easy to install; you dont have to "bring your own" email and database because theyre built in.
The server is multithreaded and scalable. In addition, SMTP, IMAP, and POP3 servers are built-in for easy connection to Internet mail. Citadel is both robust and mature; it has been in production since 1987.
Enhancements:
- IMAP ACL support.
- Small enhancements to the calendar service.
- Enhanced support for certain text-mode mobile devices.

Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. Ganglia is based on a hierarchical design targeted at federations of clusters.
It leverages widely used technologies such as XML for data representation, XDR for compact, portable data transport, and RRDtool for data storage and visualization. It uses carefully engineered data structures and algorithms to achieve very low per-node overheads and high concurrency.
The implementation is robust, has been ported to an extensive set of operating systems and processor architectures, and is currently in use on over 500 clusters around the world. It has been used to link clusters across university campuses and around the world and can scale to handle clusters with 2000 nodes.
Enhancements:
- This release corresponds to SVN revision 695 and is mainly fixing bugs.

Jabberlang is a client XMPP and Jabber library for Erlang to implement scalable fault-tolerant XMPP/Jabber agents.
The first version has been presented during Erlang User Conference (EUC 2004). For now, it still only supports a minimal subset of the Jabber/XMPP protocol but many changes are planned.
Enhancements:
- This version fixes several problems and improves the behavior of Jabberlang.
- The connection now fails when the expat library fails to load.
- A bug has been fixed regarding the name of the host used in the library, so the "to" attribute in the stream is now set correctly.

jabberd2 is a Jabber/XMPP instant messaging server. It implements most of XMPP (RFC3920), XMPP-IM (RFC3921) and a range of protocol extensions (JEP-0011, JEP-0012, JEP-0022, JEP-0023, JEP-0030, JEP-0049, JEP-0054, JEP-0077, JEP-0078, JEP-0086, JEP-0090, JEP-0091, JEP-0092, JEP-0094, and JEP-0114)

jabberd 2 is the next generation of the jabberd server. jabberd2 project has been rewritten from the ground up to be scalable, architecturally sound, and to support the latest protocol extensions coming out of the JSF.

gucharmap is a Unicode Character Map and Font Viewer. gucharmap uses gtk+ 2.0, so it supports beautiful anti-aliased scalable fonts via Xft.

Installation

To compile and install, do the usual

./configure
make
make install

There are two extra ./configure options:

--disable-gnome disables GNOME-only functionality, even if the GNOME libraries are found.

--disable-unihan disables CJK ideograph information. The ideograph information includes definition and pronunciations in several languages, and is extracted from [3]. Omitting the ideograph information will reduce gucharmaps size by roughly 2 megabytes.