Simple OKR - Track, measure and manage OKRs
OKRs.app - Reach your personal goals with OKRs
Lernit - Define objectives, assess and train your team
Objective Logistics - Create competitions for your waitstaff to increase sales
FocusOKR - Focus and achieve your goals using Objectives and Key Results
OKRStudio - Connect Trello cards to OKRs. Manage OKRs inside of Trello