monday.com, Redmine, Discord, Rocket.Chat, Asana, Mattermost, Wekan, Matrix.org, Zulip, Revolt , Goalscape, TreeSheets, Atolia, AirSend, HacknPlan, The Wheel Of Life, Total.js Messenger, Zoho Sprints, Jibility, Strategy Quadrant, cabal, Spider Project, Watership Planner are some alternatives to Priority Matrix.