The Nintendo 64 (N64 or NINTENDO64) is a home video game console developed and marketed by Nintendo. Named for its 64-bit central processing unit, it was released in June 1996 in Japan, September 1996 in North America and Brazil, March 1997 in Europe and Australia, and September 1997 in France. The Nintendo 64 was discontinued in mid-2002 following the launch of its successor, the GameCube, in 2001.
You can browse and download most available games for free below, but you will need an emulator also to play them. For Nintendo 64 we recommend https://www.pj64-emu.com/ but you can use any emulator of your choice and even original hardware if you have the know how!