smart and open source document management system
Multiple server/webapp vulnerability scanner
Database SQL, query tool, using JDBC for Oracle,SQLite,PostgreSQL,etc
Open Source Enterprise Wiki and Web Application Platform
An open source search engine with RESTFul API and crawlers
Hippo CMS is a Java based, Open Source Web Content Management platform
phpBB download manager, mainly aimed at MOD authors
Project Collaboration simplified
although fully functional, this is a pre-framework that you can extend
DuMP3 is a duplicate and similar file finder.