Open Source Project Management, Web Based Apps

Hi... Need opinions on the best Open Source/Web Based Project Mgmt apps.. our project needs: -User Login/Registration Access Control -Multiple Projects -Version Control -Doc/File Control -Issue Tracker -Ability To Search Docs/Files -Admin Function -File Checkin/Checkout -Ability to review files via web - Reviewed a bunch of apps.. but now I'm curious as to what the group thinks... The app/project that this system supports probably won't be open source.. so i can't use a proprietary app under the guis of creating an open source project.. thanks for your time on this! tom