Walnut Creek CDROM (of Walnut Creek, California) was an early provider of freeware, shareware and free software on CD-ROMs. The company was founded in August 1991 by Bob Bruce and was one of the first commercial distributors of free software on CD-ROMs. The company produced hundreds of titles on CD-ROMs, and ran the busiest site on the Internet, ftp.cdrom.com, for many years.
In the early years, some of the most popular products were Simtel shareware for MS-DOS, CICA Shareware for Microsoft Windows (now the Sunny A archives), and the Aminet archives for the Amiga. In January 1994, it published a collection of 350 texts from Project Gutenberg, one of the first published ebook collections.
Walnut Creek developed a close relationship with the FreeBSD Unix-like open source operating system project from its inception in 1993. The company published FreeBSD on CD-ROM, distributed it by FTP, employed FreeBSD project founders Jordan Hubbard and David Greenman, ran FreeBSD on its servers, sponsored FreeBSD conferences and published FreeBSD books, including The Complete FreeBSD. By 1997, FreeBSD was Walnut Creek's "most successful product", according to Bruce. From 1995 onwards, Walnut Creek was also the official publisher of Slackware Linux. Walnut Creek also gained fame for its idgames
directory, which was the de facto distribution center for the Doom-engine modification community at the time.
As more users gained access to high speed Internet connections, demand for software on physical media decreased dramatically. The company merged with Berkeley Software Design Inc. (BSDI) in 2000 to focus more engineering effort on the similar FreeBSD and BSD/OS operating systems. Soon after, BSDI acquired Telenet System Solutions, Inc., an Internet infrastructure server supplier.