My suggestions Rails projects 1. Gitlab 2. Code triage 3. Redmine (Especially plugin architecture) Gems 1. Rails (How to arrange big libraries) 2. Pundit (

My suggestions Rails projects 1. Gitlab 2. Code triage 3. Redmine (Especially plugin architecture) Gems 1. Rails (How to arrange big libraries) 2. Pundit (Get the things done in simple object oriented way) 3. Spina ( mountable rails engines)