Knowledge Tree is an online DMS (Document Management System), it allows user to upload new files and then perform file version control subsequently. All files can be indexed through a Java-written indexer, it supports some popular document formats such as .DOC, .XLS, .PDF and .TXT. Documents can be grouped by folders and each individual document can assign access control. The application is easy to use but with few display language selections and being difficult to change the look-feel of the site.