Registration/Login -Application/Script

Hi... We're in need of a sophisticated,robust,secure regiatration/login script/application for a site we're starting to develop. It occurs to us that there should be an Open Source solution to this given that there have been plenty of solutions for this and a lot of companies have gone up in flames!! Hopefully, one of the flamed out companies will have left there code for the rest of us..... Be that as it may. We're looking for something that's perl/php/mysql running on a Linux platform... Thanks Bruce bedouglas@earthlink.net