Info-ZIP portable compression/archiver utilities (Zip, UnZip, WiZ, etc.)
Converter of various scalable font formats (most notably TTF) and of the bitmapped BDF format into PostScript Type 1 fonts and metrics (.pfa, .pfb, .afm).
BeRDP is a project dedicated to bringing the RDP protocol to the BeOS platform utilizing the rdesktop project.
Client-server networking library
The MUSCLE system is a fast, portable, flexible client-server system for distributed applications. Clients send BMessage-like PortableMessages to each other either directly or via a centralized server (with built-in database and 'live query' support).