Take a look at Linear. We're all in.
As simple as Pivotal, none of the bloat of Atlassian tools.
You can set Linear up to almost emulate a Pivotal experience, but I personally love the keybinding first user experience of Linear. It makes it incredible fast to navigate, and its easy for all members to view the status of projects.
Looks neat but we're all in on Tracker so not sure switching is on the cards. I'll keep it in mind for other projects/teams in the future though, thanks.
