This article is from the Problem Management Tools FAQ, by Dave Eaton dwe@arde.com with numerous contributions by others.
PTS is a web-based project/problem management system which uses a SQL
server back end. PTS has been rewritten into Keystone, a far more
flexible and powerful ticketing / project management system. Both are
available at http://www.stonekeep.com. PTS is free, and Keystone is
free for up to 10 concurrent users, after which there is a small fee
requested.
 
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