phpGroupWare (formerly known as webdistro) is a multi-user groupware suite written in PHP. Its provides a Web-based calendar, todo-list, addressbook, email, news headlines, and a file manager. The calendar supports repeating events. The email system supports inline graphics and file attachments. The system as a whole supports user preferences, themes, user permissions, multi-language support, an advanced API, and user groups.
Leafnode is a news server, suitable for small, limited-bandwidth sites with only a few users (and useful for offline news reading). Leafnode keeps track of which groups are being read and downloads only articles in those groups. Leafnode has been designed to require no maintenance and to be easy to set up.
sn is a small news system for sites which serve perhaps a few dozen newsgroups, and which have a slow connection to the Internet. The target user is a home or SOHO with a single modem connection to the Internet and serving a few workstations. sn also includes a mail-to-news filter.
nget is a commandline NNTP file grabber. It automatically pieces together multipart postings for easy retrieval, even substituting parts from multiple servers and newsgroups. It handles disconnects gracefully, resuming after the last part successfully downloaded, and caching of header data for quick access. It automatically downloads only as many par/par2 files as needed.
Urd is a Web-based Usenet binary download manager. It stores the newsgroup information in a MySQL database and aggregates the articles into sets of a single download (e.g. one album or movie). The Web interface can be used to search with regular expressions. It uses its own downloading daemon that has support for scheduling downloads and updating databases. URD can also download directly from NZB files and even create NZB files. Further features include custom scripts, multiple languages, a template based Web interface, support for multiple servers, automatic par2 and unrar support, and an intuitive user interface.