C64 Forever is described as 'revolutionary Commodore 64 emulator, preservation and support package'. There are five alternatives to C64 Forever for a variety of platforms, including Mac, Windows, Linux, BSD and Haiku. The best alternative is VICE, which is both free and Open Source. Other great apps like C64 Forever are Frodo (Free), JaC64 (Free, Open Source), Hoxs64 (Free) and Power20 (Paid).
VICE is a program that runs on a Unix, MS-DOS, Win32, OS/2, Acorn RISC OS, BeOS, QNX 4.x, QNX 6.x, Amiga, GP2X, Dingoo, Syllable, SkyOS or Mac OS X machine and executes programs intended for the old 8-bit computers.
Hoxs64 is a Commodore 64 emulator for Microsoft Windows 10. The emulator substantially reproduces this legacy machine in minute detail. Hoxs64 is available for download. - Cycle based CPU, CIA, VIC and SID. - 1541 Disk drive. - Tape deck. - Full screen mode.
Power20 is an emulator for the Commodore VIC-20. It allows you to run your favorite VIC-20 software on your Apple Macintosh (with PowerPC or intel-CPU) at full speed with smooth graphics and great sound.