This app was mentioned in 4 comments, with an average of 1.00 upvote
Summons, are not weak and sometimes are more powerful then a summoners eidolon. If you have a smartphone but this app it has a roller and everything.
https://play.google.com/store/apps/details?id=com.dragora.summonerpftot
It's a badass app, its a paid app but worth every penny.