GAG is a Graphical Boot Manager with a lot of features. It doesn't need a partition, it works with primary and extended partitions in every hard disk, it has a lot of icons, it allows you to put passwords for each operating system, it can swap hard disks and it can be tested from diskette. The SafeBoot feature allows you to boot your hard disk even if GAG is overwritten. It includes extensive support for many languages and keyboard types.
FBZX is another Sinclair Spectrum emulator for Linux, but with an special feature: it works with the framebuffer, so it can work at full speed and full screen. Its main features are extremely accurate emulation of screen and sound (both speaker and AY-3-8912 sound chip), emulation of joysticks (kempston, cursor, and Sinclair), and emulation of 48K (both issue 2 and issue 3), classic 128K, Plus 2, and Plus 2A. It supports Z80 snapshot files (both loading and saving) and TAP files (allowing normal loading or fast-speed loading).
GtkPSproc is a GUI frontend for PSUTILS. It allows you to adjust all programs to your printer type (for example, always sending the pages in reverse order), to group two or more pages on a single sheet, to print booklets, and to easily print in double-sided fashion. It is designed to work from nearly all programs that call LPR, acting as an intermediary between the program and LPR, but it can work alone, too.
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.