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
Altstore - A home for apps that push the boundaries on iOS
RocketAPK - See related links to what you are looking for.
Colorware iPhone Retro - A vintage, 80s-inspired iPhone
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.
Mowned - A journey to phone nostalgia