The technology landscape has seen many technologies come and go (RIP, Fortran, MS-DOS, NetWare, Lotus 1-2-3, and VAX/VMS).

But if you look around, you'll see some fundamental technologies in widespread use that have withstood the test of time, going strong after 25 years -- even 50 in some cases. Join me now in a celebratory tour of a special group of high tech's still-kicking senior citizens: the technologies that geeks know and love, and that tend to make a lot of everyday technology work.

Also at InfoWorld.com:

• Slideshow: Tech survivors: Computer technologies 25 years or older you still use
• The best tech of 2011: InfoWorld's Technology of Year winners
• The geekiest iPad apps ever
• 12 tech revolutions that fizzled

This slideshow, "Tech survivors: Geek technologies that still thrive 25 to 50 years later," was originally published at InfoWorld.com. For the latest developments in business technology news, follow InfoWorld.com on Twitter.