163,000 Words (No longer a WIP!), Gen
Summary: After killing Voldemort during seventh year, Harry vanished without a trace. But now, 8 years later, a deadly secret forces him to return and it seems that only Snape will be able to save him.
Resonance by GreenGecko (sequels Revolution and Resolution)
528,000 Words, Gen (Harry dabbles in Het relationships here and there, but still mostly Gen)
Summary: Year six and Harry needs rescuing by Dumbledore and Snape. The resulting understanding between Harry and Snape is critical to destroying Voldemort and leads to an offer of adoption. Covers year seven and Auror training.
I will go out on a limb and risk offending every HP writer out there (though none is intended), but I'll say it anyway: Never has a better Harry Potter story ever been written. Not in fanfic, not by Ms. Rowling herself. Seriously, if you ever have even a remote interest in this fandom, you must read this story.