ReqTools is a library to help developers create requester windows in graphic applications under X. It is based on GTK+, and its APIs are very flexible and easy to use. It offers a lot of ready to use requesters, and the user can create his/her own. It comes with complete documentation in both HTML and PDF format.
The RPCAP (Remote Packet CAPture) system for Linux allows the capture of network traffic on a remote system. It is a two component system, with a "server" component running on the remote system, which uses libpcap to capture network packets, and uplink them to the client system. The client side component of rpcap is a library called librpcap, which exposes a subset of the libpcap API. The client and server components use standard Sun RPC communication mechanisms for providing a transparent, libpcap-compatible API for the capture of remote network traffic.
Jester/BMD (BookMark Database) is a system for sharing Web bookmarks over the Internet. It works by connecting the personal databases of its users and mirroring changes from user to user so any record added by one user eventually spreads to every other user. This effectively builds a shared collection like dmoz.org, in a database format.
SMLserver is a Web server plugin for AOLserver, an Open Source multi-threaded Web server provided by America Online and used for large-scale, dynamic Web sites. SMLserver allows efficient threaded execution of Standard ML programs and inherits many of the great features of AOLserver, including the possibility of accessing a variety of different relational database management systems (RDBMSs), such as Oracle, MySQL, and PostgreSQL.