File-Picker is a program to display and choose files from your Web site. It supports multiple languages. It uses AJAX to allow the user to interact with the server without reloading the page. You can pick several files at the same time. Its visual interface looks like a file explorer.
OpenGrok is a fast and usable source code search and cross reference engine. It helps you search, cross-reference, and navigate your source tree. It can understand various program file formats and version control histories like Mercurial, Bazaar, Git, ClearCase, Perforce, SCCS, RCS, CVS, or Subversion. In other words, it lets you grok (profoundly understand) the source.
SVNKit is a pure Java Subversion (SVN) client library. This means that users of the library (i.e. Java applications) do not have to include svn native binaries or javahl bindings to work with subversion repositories. It is not only a 100% Java replacement for javahl bindings, but also a library that provides a high level of control over subversion repository operations.