Lattice - Lattice helps teams stay aligned around their goals so they can accomplish more.
OKRStudio - Connect Trello cards to OKRs. Manage OKRs inside of Trello
Synergita - Employee Performance Management Software
OKRs.app - Reach your personal goals with OKRs
Small Improvements - Human-friendly performance management that helps employees grow and succeed
Perdoo - OKR methodology, software and coaching