CreatiVEmu
Emulators

CreatiVEmu
Emulator by Roberto Ventura, coded in 2001 for use with MS-DOS and then then made Windows-compatible a few months later. It supports all existing ROMs with accurate video and audio emulation. Complete cassette tape player emulation, allowing the load/save of BASIC listings through custom "binary log" format.
Unfortunately it's never been publicly released and it's marked as "discontinued" since 2002.

Emulator name O.S. Version Date Home Screen
CreatiVEmu [unavailable] Windows prv beta - click to visit homepage -
CreatiVEmu GUI [unavailable] Windows prv beta - click to visit homepage click to view screenshot

CvEmu2
Emulator by Giovanni Ortu, supporting all existing ROMs (except the new formats for 6 and 18KB) with full video emulation, no audio emulation, and featuring a Work-in-progress in-game menu. Programmed with C and SDL, compiled for Windows and Linux. Source code available.

Emulator name O.S. Version Date Home Screen
CvEmu2 + Spartan 2.0 Windows 0.6.1 06/01/2008 click to visit homepage -
CvEmu2 + Spartan 2.0 Linux 0.6.1 06/01/2008 click to visit homepage -
CvEmu2 (source code) - 0.6.1 06/01/2008 click to visit homepage -
Spartan (graphics interface, source code) - 2.0 06/01/2008 click to visit homepage -

Notice: download files from the auhor's website

FunnyMu
Emulator by Paul Hayter, supporting 4, 8, 10 and 12KB ROMs with full video and audio emulation, unfortunately has no in-game menu and can't be configured. Programmed with C and SDL, based on MAME and ColEm source code, compiled for Windows and Linux. Source code available.

Emulator name O.S. Version Date Home Screen
FunnyMu Windows 0.43 02/28/2002 click to visit homepage -
FunnyMu (source code) - 0.43 01/20/2002 click to visit homepage -

FunnyMu (unofficial)
My personal revision of FunnyMu, with a few additions:
 - fully compatible with all currently dumped ROMs (also 6, 10, 16 and 18KB ROM formats)
 - correct colour palette (matching the one in MAME)
 - support for right controller emulation and complete keyboard emulation
 - mathematics bug-fixes here and there
 - screenshot save
 - load/save BASIC listings in plain text format
 - settings stored to .ini file
 - windowed and fullscreen modes available
Windows version is fully compatible with the new CreatiVe-UI graphics interface, also featuring a quite detailed games database with screenshots.
Amiga version also available by Amigan Software.

Emulator name O.S. Version Date Home Screen
FunnyMu (unofficial) Windows 0.49 11/09/2009 click to visit homepage -
FunnyMu (unofficial) Amiga 0.48 R1 07/13/2008 click to visit homepage -
FunnyMu (unofficial) (source code) - 0.49 11/09/2009 click to visit homepage -
CreatiVe-UI (graphics interface) Windows 1.08 11/09/2009 click to view screenshot

MESS (Multiple Emulator Super System)
Since version 0.135 (released on November 7th, 2009), M.E.S.S. includes my revision of the Creativision driver, with a few additions and bug-fixes to previous releases.
Emulation quality is very high, though there's still much work to do in order to add several missing features, and to make input management a little more user-friendly.

Emulator name O.S. Version Date Home Screen
MESS + MESSUI Windows 0.135+ - click to visit homepage -
MESS + MESSUI (source code) - 0.135+ - click to visit homepage -

Notice: download files from the official website