Altstore - A home for apps that push the boundaries on iOS
APK Pure - Download apk for Android with APKPure APK downloader. NoAds, Faster apk downloads and apk file update speed. Best of all, it's free
Colorware iPhone Retro - A vintage, 80s-inspired iPhone
App Free Ads - Promote your apps for free and get more installs.
MacMenuBar - A curated directory of 200+ Mac menu bar apps
F-Droid - F-Droid is an interesting alternative for Android users who want to try something different and not have to use the Goole Play store all the time.