None of these link lists require link backs as of the time I put this thing together, but that may change at any time so make sure you check the rules often. 
Also, just because they don't require a recip doesn't mean you can't give them one it is up to you.

Night surf  
no rules per se[submit]
[dead?]

Submit like Dmoz
Sex collective [Rules] [submit]
[dead?]

This is also the page I use to submit to SE's so if you want to submit to them:

Easy SE's

Hard SE's