Bluemote helps you use your bluetooth-enabled T610 (or compatible Sony Ericsson phone) as a remote for your Linux PC. It includes mouse and keyboard emulation, events support, volume control, and a built in micro scripting language for menus. The menu displayed on the phone is highly customisable.
Z88Transfer is a transfer utility written with Python and PyGTK that allows a Linux machine to send and receive files from Z88 computers (created in 1987 by Sir Clive Sinclair in his last computer company, Cambridge Computers). Z88transfer supports IMP-EXPORT, EAZYLINK, and PCLINK-II protocols, and can convert automagically between Abiword/RTF format and PipeDream, Z88's native format.
ADTPro transfers disks to and from Apple II and Apple /// computers and the modern world using any of these communications methods: serial/USB, UDP via the Uthernet or LANceGS Ethernet cards, or audio via the Apple's cassette ports. ADTPro has comprehensive bootstrapping support for otherwise diskless Apple IIs. The home page includes extensive tutorials for getting started.