I've been using Asana for years but there have been a lot of quality issues with the software... and various bugs that just don't get fixed. They also put colum

I've been using Asana for years but there have been a lot of quality issues with the software... and various bugs that just don't get fixed. They also put columns and some sorting options behind a paywall. Are there any similar OSS tools? I just need task tracking that works offline, on mobile, let's me filter/sort, and creating public shareable links for customers would be a nice bonus. It's probably something I could whip up in an hour with Django but open to options.