CreatiVEmu
Emulator by Roberto Ventura, coded in may 2001 for use with MS-DOS and 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 to load/save 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	-		-
CreatiVEmu GUI [unavailable]	Windows	prv beta	-

creatiVision emulator
The most recently developed emulator of the creatiVision, also featuring full compatibility with the Laser 2001 and Salora Manager home computers through a self-developed version of the BIOS. Great overall emulation quality and an useful option to load programs from cassette dumps. Programmed with C and SDL. Source code available. No user interface (command-line operated).

Emulator name	O.S.	Version	Date	Home	Screen
creatiVision emulator	Windows	2016-04-24	24/04/2016		-
creatiVision emulator (source code)	Win/Linux	2016-04-24	24/04/2016		-

Notice: download files from the official website

CvEmu2
Emulator by Giovanni Ortu, supporting all existing ROMs (except the new formats for 6 and 18KB) with full video emulation, no audio emulation. Featuring a preliminary 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
CvEmu2 + Spartan 2.0	Linux	0.6.1	06/01/2008		-
CvEmu2 (source code)	-	0.6.1	06/01/2008		-
Spartan (graphics interface, source code)	-	2.0	06/01/2008		-

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 codes, compiled for Windows and Linux. Source code available.

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

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.
Wii version also available by Wiimpathy.

Emulator name	O.S.	Version	Date	Home	Screen
FunnyMu (unofficial)	Windows	0.49	11/09/2009		-
FunnyMu (unofficial) (source code)	Win/Linux	0.49	11/09/2009		-
FunnyMu (unofficial)	Amiga	0.48 R1	07/13/2008		-
FunnyMu (unofficial)	Wii	0.1	11/16/2012	-	-
FunnyMu (unofficial) (source code)	Wii	0.1	11/16/2012	-	-
CreatiVe-UI (graphics interface)	Windows	1.12	24/10/2016

MAME (formerly MESS)
Since version 0.135 (released on November 7th, 2009), MESS 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 bit more user-friendly.
As of 2017, MESS is incorporated in MAME.

Emulator name	O.S.	Version	Date	Home	Screen
MAME	Various	0.193+	-		-

Notice: download files from the official website