Is there any mod or something that tells me if there are any non-radient quests I have missed?

Radiant means there are always more to do.

No mod that I am aware of that can track that, the http://www.uesp.net/wiki/Skyrim:Quests lists all of the quests for Skyrim, so you can use that as a reference.

He did say "non-radiant" though. Edit: Wait, laurisplus edited the original post, so ignore me if it was different before.

No mod that I know of, though there is http://www.nexusmods.com/skyrim/mods/51284/?.

Yes, I edited the original post. Should I somehow mark the fact that post has been edited? Not sure how to use this webpage correctly.

You could just edit your original post again, and add at the bottom something like -

EDIT: to clarify, after Ghastley's post, that I meant non-radiant quests.

It's not strictly necessary to edit your OP if you make a change, but a common courtesy - otherwise subsequent posts can make their author look foolish or mistaken when their response is taken out of the original context.

Just saves confusion and embarrassment in the long run.