<a href="http:&#x2F;&#x2F;up-for-grabs.net&#x2F;" rel="nofollow">http:&#x2F;&#x2F;up-for-grabs.net&#x2F;</a> attempts to make contributing easier for new developers but it still falls flat IMO, there are few really bite-sized issues you can tackle and even those are going to require you to read a lot of project code and discussion to figure them out.