Topcoder is a well known competition arena for the algorithm geeks. Now we have got some tools that help us parse the problem definition on the topcoder and generate template code for the problems, and the test cases too.

Well I checked and played around many such tools. To list a few:

1. Eclipse coder (recommended).
2. KawigiEdit
   
3. Topcoder Auto Gen

Eclipsecoder is a cool plugin for the eclipse platform. It can generate code for you in C++/Java not in C. Now as the tool is very new it crashes sometimes, but comparing the advantages it is nothing.
The main problems that I faced were with Http tunelling option in it. It was not allowing me to check mark it. The problem seem to be of the arena applet. Seeing the posts on the forums a guy got the same problem and got rid of it by making a fresh installation of eclipse and Eclipsecoder plugin. Well it didn't worked for me. Still fighting with it. [will post the solution soon.]

In Eclipsecoder you can also play on the problem archive. It is really cool feature. In it you can work around with the submissions too.

Now in KawigiEdit the editor is for Topcoder. Got a good parser, with topcoder's GUI. The coder generated is also nice. The recommended one, if you don't want to use Eclipse feature..

Topcoder AutoGen is a windows-only tool. Easy to use but does not have a good parser. Usually misses the tricky test cases.