PandaHunt is a problem classifier utility, designed to aid in practicing of competitive programming problems. URL : http://onlinejudge.net84.net/PandaHunt/index.php
As of 15 January 2014,
Problems : 18407
Users : 16
Features :
1. Adding/Deleting of tags
2. Searching of problems by name, code, title, author, resource and tags
3. To-Do List of problems (Only after login) 4. Filter by Online Judges