For the past 3 months in my spare time I was developing this list with Awesome Android Alternatives! Please check this out, you might find something useful, or maybe you can help me make it even better. Have an awesome day!

• AAA

  18 1,348 8.4

  :iphone: Curated list of THE BEST FOSS Android apps to maximize your freedom & privacy!

• Alarmio

  4 324 0.0 Java

  Discontinued A simple alarm clock focused on design, readability, and internet radio.

I am aware of it. On Google Play you may encounter money demand, but in F-Droid or GitHub releases you just simply cannot. Note that Alarmio is not still maintained but when I tested it I did not encounter any issues with it, so I acknowledged polished experience rule.

• InfluxDB

  www.influxdata.com featured

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• k-9

  53 6,819 9.7 Java

  Discontinued K-9 Mail – Open Source Email App for Android [Moved to: https://github.com/thundernest/k-9] (by k9mail)

  

I agree because I need to test it. I am aware of K-9 Mail and FairMail though.

• FairEmail

  218 2,719 10.0 Java

  Fully featured, open source, privacy friendly email app for Android

I agree because I need to test it. I am aware of K-9 Mail and FairMail though.

• Tutanota makes encryption easy

  467 5,736 9.9 TypeScript

  Tuta is an email service with a strong focus on security and privacy that lets you encrypt emails, contacts and calendar entries on all your devices.

  

You could also look into Tutanota

• SchildiChat-android

  6 374 0.0 Kotlin

  Matrix client / Element Android fork

  

The most obvious one is that all chats can be in one tab https://github.com/SchildiChat/SchildiChat-android/blob/sc/FEATURES.md

Suggest a related project