Fossify Calendar★★★★☆Basic calendar app that works with your phone’s local calendars. You can do all the usual things you want to use a calendar for on your phone. Doesn’t clutter up your schedule with ads or vacuum up your personal data.
Fossify Contacts★★★★☆Basic, privacy-respecting contacts app for Android that works with all contacts accounts on your phone.
Geary★★★★☆Really lightweight but still modern, so it’s a good choice on lower-end hardware. Basic IMAP features, good for most day-to-day email use. Needs GNOME for setup.
Gmail (Android App)★★★☆☆Works well with multiple accounts and display modes, but tracks you more than it should.
Google Docs, Sheets and Slides★★★☆☆Fast cloud-based office suite, with good collaboration and mobile support. Too bad I don’t trust Google’s servers any more than Microsoft’s these days.
K-9 Email★★★★☆Classic email app for Android: No frills, no ads, no tracking. Supports multiple accounts, phone-to-tablet layouts, and dark mode.
LibreOffice★★★★☆A complete open-source and Free office suite for your desktop or laptop, comparable to and largely compatible with Microsoft Office. I’ve been using the word processor and spreadsheets for decades on Linux, years on Windows, and occasionally on macOS.
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.
Microsoft Outlook (Desktop)★★★☆☆I won’t say I’ve never liked Outlook, because the macOS version has been pretty decent for a while now (if a bit of a resource hog), but the Windows versions have always been awkward, cluttered, and quirky.
Nextcloud Calendar★★★★★Self-hosted, web-based calendar that syncs easily with other apps and has completely replaced Google Calendar for me.
OpenTasks★★★★☆Simple to-do list that works great with a Nextcloud server or local storage on your phone.
SeaMonkey (Internet Suite)★★★☆☆The old Mozilla Suite lives on! Featuring web, email, news, an HTML editor, IRC client and more. Recent work has mostly been to keep it working and backport security fixes, so web app compatibility lags way behind even the ESR Firefox.
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.
Vivaldi (Web Browser)★★★★★Spiritual successor to the original Opera browser, this ultra-customizable web browser can open into a full suite for email, calendar, feeds and more – but only if you want it to.
Windows 10 Mail and Calendar (discontinued)★★★☆☆Not a bad email client. Snappy, works with multiple accounts. Some issues with Nextcloud calendar and contacts. So of course it’s been discontinued in favor of Outlook.