Gmail (Android App)★★★☆☆Works well with multiple accounts and display modes, but tracks you more than it should.
Instagram★★☆☆☆Like checking out your friends’ vacation photos, but every other photo is an ad, and half of your friends’ pics are full of product placement.
K-9 Email★★★★☆Classic email app for Android: No frills, no ads, no tracking. Supports multiple accounts, phone-to-tablet layouts, and dark mode.
KeePass2Android★★★★★Nice, clean interface to a KeePass2 database with auto-fill support for both websites and apps and seamless syncing over your own server or the cloud of your choice.
Microsoft Outlook (Android)★★★★☆It works. More stable than the desktop version. Handles mail, calendar and contacts, offers the focused/other inbox view. Tries to keep you in Microsoft’s apps. OK for work, wouldn’t use it for personal mail.
OpenTasks★★★★★Simple to-do list that works great with a Nextcloud server.
PixelDroid★★★★★Optimized for photo sharing and viewing, works smoothly and integrates well with the system. FOSS, won’t vacuum up your personal data.
StreetComplete★★★★★StreetComplete is an easy way to contribute to OpenStreetMap on the go, as a beginner, or both from your Android phone.
Target (app)★★★★★Well-designed, runs smoothly, great for ordering items to pick up in-store or for shipping.