I'm in the midst of building a Master Summoner, and as usual, I find myself pretty meh on a lot of the currently available first-party summoning feats available. I really don't care about my eidolon.
So, my question is: What third party feats are out there for enhancing the summoning of monsters?
If your GM allows some 3.5 throwback material, I've got some favorites that I used on my master summoner.
Beckon the Frozen: https://www.dandwiki.com/wiki/SRD:Beckon_The_Frozen
With summon minor natural ally, that's a bunch of weasels that attach for 1d6 cold damage per round. Nice!
Cloudy Conjuration is also situationally fun, and good for getting concealment.