nostr:npub1swx3chfqny95dw6tntd59sd8385df3cvyuym8ezg7yuzdq5wnk6qqaklf7 have you checked alternativeto yet? There's still 16 options after applying the open source filter, but I guess you could also filter by your preferred OS and then prioritize the more actively developed projects?
https://alternativeto.net/software/harvest/?license=opensource