SmallBASIC is a free interpreter for BASIC, a simple computer language, targeting simplicity, mathematics, and graphics. Also, it has a powerfull string library, supports external C modules (shared libs), uses dynamic arrays (by default) and has no data types. Versions exists for Linux (or other Unix), PalmOS, DOS, Win32, VTOS (Helio), and Franklins (eBookman). It uses a lot of drivers, including svgalib, ncurses, and framebuffer.
Romeo is a tool for constructing customized Palm OS ROM images. With Romeo, you can remove unused default applications from your Palm, and install other applications in ROM to save RAM and increase their durability. Romeo can also display a great deal of information about the structure of Palm OS ROMs and PRCs.
The pilot-link suite of tools contains a robust library and a series of conduits for moving information between your desktop or workstation and your Palm handheld device, such as those made by Palm, Sony, Handspring, Handera, and others. It also includes language bindings for languages such as Perl, Python, and Java.
palmfs is a PalmOS filesystem access software for Linux, based on FUSE. It consists of two parts, a client and a server. The client is a FUSE-based application running on the Linux system. The server part is a PalmOS application that actually executes commands sent by the client. It is intented to support various communication ports and to access the PalmOS internal filesystem as well as expansion cards.