I’m using Boostcamp at the moment: free version, not open source, and its bothering the hell out of me. Limited. Bloated. Paywalls. I love the detailed programs and routines, and have not found a similar replacement. Any recommendations that include:
Routine creating
Custom exercises
Access to existing database of workouts (most important).
Have you considered maybe purchasing the app? It would fix at least one of your issues.
I’m not a shill, I just remember the guy pitching the app on reddit, and it seemed like a super small team trying to compete with massive companies.