Apple Mail (macOS)★★★★☆No-nonsense but full-featured email application for macOS that works well with multiple IMAP accounts and Gmail.
BBEdit★★★★★Text editor for macOS that's powerful enough to handle multi-megabyte files and still light enough to jot down notes.
Jellyfin★★★★★Great for playing music across my local network, doesn't phone home to a cloud or try to upsell subscriptions.
KeePass Password Managers★★★★★KeePassXC, its browser extension, and KeePass2Android are a nice, clean set of apps to manage your passwords on your OWN desktop and mobile devices, auto-fill websites and apps, and sync over your own server or cloud provider.
Manyverse★★★★☆Takes the pain out of setting up and running SSB. Unfortunately it doesn't overcome SSB's inherent challenges of discovery, data size or multiple devices. (So far?)
NetNewsWire★★★★★Clean, stable, fast, free, no-clutter and no-nonsense RSS/Atom newsfeed reader for macOS and iOS.
Thunderbird (Email and Calendar)★★★★★Stable, capable desktop email application, works well with multiple accounts including Gmail, Nextcloud, easy to set up and use but with advanced settings when you need them. FLOSS.
Wine and Crossover★★★★☆THE major compatibility tool for Windows apps on Linux or macOS, including SteamOS. And a commercial distribution with installers and support.