Sinclair Spectrum/QL Emulators

Name	Description
Hob	Hob is a very good Spectrum emulator for java. At the webpage you can choose from a number of games to play online.
J80	J80 is a CP/M 2.2, CP/M 3.0 and Spectrum 48/128k emulator for Java. Its Spectrum 128k emulation is currently incomplete but working.
Jasper	Looks like a decent emulator. It includes snapshot support, double buffered screen, and a click-on progress bar to switch emulation speeds.
Spectrum for Java	This appears to have been discontinued in 1997, but the source is public domain, so you can tweak around with it.

Sinclair Spectrum/QL Emulators on Other Platforms

Windows/DOS (43)
Unix/Linux (8)
BeOS (1)
Macintosh (1)
Consoles
-- Dreamcast (3)
-- Playstation (1)
-- Playstation 2 (1)
-- Game Boy / Advance (2)
-- Nintendo DS (4)
-- Game Park 32 (3)
-- Playstation Portable (1)
Digital Phones (2)

Emulators For:
Windows/DOS
Unix/Linux
BeOS
Macintosh
Amiga
Consoles
Java
Palm OS
Pocket PC
Digital Cameras
Digital Phones
Calculators
QNX
Windows Mobile Smartphone

Other Releases
Extenders
Frontends
ROMs (Public Domain)
Hacks
Cheats
Movies
Savestates
Music
Technical Documents
Translations

Utilities:
General
Auditing
Cheating
Development
Game Modification
Music and Video
Plugins