Add uDebug

README.md

@@ -168,6 +168,7 @@ It is advised that you write yours first before looking at others'.
 | ★★☆ | Syntax Highlighters: ... [tohtml.com](https://tohtml.com/) ... [markup.su](http://markup.su/highlighter/) ... [hilite.me](http://hilite.me/) | Very handy for creating slides or team notebooks with pretty, formatted code snippets. Just copy the highlighted code snippets and paste them in your favorite WYSIWYG (What-You-See-Is-What-You-Get) editor! |
 | ★★☆ | Code Sharing: ... [Ideone.com](http://ideone.com/) ... [Pastebin.com](http://pastebin.com/) ... [Ubuntu Pastebin](http://paste.ubuntu.com/) | These tools generate semi-permanent pages for code sharing. Very useful especially when you're trying to get someone else to look into your code. |
 | ★★☆ | [Ineffable](http://codeforces.com/blog/entry/19083) | A simple command-line grader for local grading. |
+| ★★☆ | [uDebug](https://www.udebug.com/) | A platform that provides expected outputs for user-specified inputs to problems on the UVa Online Judge. Some problems also provide additional test cases for debugging. |
 
 #### Contest Preparation