Openline is the open source version of Hotline. Hotline is a PC/MAC client/server application that provides users the ability to create and manage a desktop community. The application has file uploading and downloading, instant messaging, a bulletin board, threaded news, and public and private chat.
BitTorrent++ is a client for the BitTorrent peer-to-peer file sharing solution. Based on the original BitTorrent software, it is also written in Python using wxPython for the GUI, thus allowing it to run on Win32 as well as Linux-like platforms. It improves (or will improve) many parts of the original software, like downloading of multiple files at once, configuration of upload and download speeds, as well as other behaviours. The GUI and usability is also to be improved greatly.
OpenLMS is a Learning Management System (LMS) made at the Department of Geography, NTNU. The system is a fully functional LMS with support for group collaboration, file sharing, distribution of lectures, and other supporting features. It is a good tool for distributing lecture notes to groups of students, and for faciliating collaboration for groups of students and teachers.
Xerver is a fast, tiny Web server which allows you to run CGI scripts (Perl, PHP, etc.), create aliases (virtual directories), allow/deny directory listings, create your own error pages ("404 Not Found"), allow/deny CGI scripts, password protect folders, choose your own index file extensions, share/unshare hidden files or files with certain file extensions, share unlimited folders, etc. It supports HTTP/0.9, HTTP/1.0, HTTP/1.1, and all HTTP methods (GET, POST and HEAD).
Glubs is a clubbing system similar to Yahoo! or MSN Groups. Users browse through a category-hierarchy and create clubs to share news, files, pics, links and a calendar with friends. Some of the core features are multi-language and -timezone support, and custom HTML templates/skins.
Easta is a Napster-inspired peer to peer filesharing system, built to operate entirely over email (POP/IMAP+SMTP). More people have access to email than any other service, and in addition it gives easy access to file-sharing for the 90% of the planet stuck behind a firewall without a SOCKS connection. There's some nice side-effects too, such as asynchronous downloading, even when you're offline.