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Maxima, the computer algebra system that is still actively maintained, started out as Macsyma in 1968.

• downerending 7y ago
  Didn't even know it had been renamed. Now I really feel old...
  • nathell 7y ago
    Not exactly renamed, just forked in 1982 and open-sourced.
• CJefferson 7y ago
  Gap, a computational group theory system isn't quite as old, but it has been going since 1986 making it 30 years old.