Linear

Linear is an issue tracker and project planning tool for teams that build software. Work is organised into issues, projects and cycles (time-boxed sprints), with roadmaps for planning across teams.

It's known for a fast, keyboard-driven interface: most actions have a shortcut, and a command menu reaches everything. Linear connects to GitHub and GitLab so pull requests move issues along, and to Slack for notifications and triage. It runs in the browser, as a desktop app and on mobile. There's a free plan for small teams, with paid plans per user.