Simple OKR - Track, measure and manage OKRs
OKRStudio - Connect Trello cards to OKRs. Manage OKRs inside of Trello
OKRs.app - Reach your personal goals with OKRs
Digital Toucan OKR for Jira - Collaborate around measurable goals to realize your ambitions.
Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
SugarOKR - A super simple and easy-to-use free OKR management software for teams.