K-9 Mail

K-9

Web site: k9mail.app
Category: Network
Subcategory: Email Clients
Platform: Android
License: Apache 2.0
Interface: GUI
Programing language: Java, Kotlin
First release: 2016
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K-9 Mail – an open-source email client for Android focused on making it easy to chew through large volumes of email. K-9 supports IMAP, POP3 and Exchange 2003/2007 (with WebDAV). K-9 is a community developed project.

K-9 Mail was born when Jesse Vincent created a simple patch to the Email app included in Android 1.0.
The application is licensed under the Apache License, Version 2.0.

Element

Riot

Web site: element.io
Category: Network
Subcategory: Instant Messengers, VoIP
Platform: Android, iOS, Linux, OS X, Windows, Web client
License: Apache
Interface: GUI
Programing language: JavaScript, OjectiveC, Swift, Java, Kotlin
First release: 2016
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Element (previously: Vector and Riot) – a Matrix web client built using the Matrix React SDK. Matrix is an open network for secure, decentralized communication, connecting 18M+ users over 45K+ deployments.

Element is officially supported on the web in modern versions of Chrome, Firefox, and Safari. Other browsers may work, however official support is not provided.

Element has several tiers of support for different environments:
– Definition: Issues actively triaged, regressions block the release
– Last 2 major versions of Chrome, Firefox, and Safari on desktop OSes
– Latest release of official Element Desktop app on desktop OSes
– Desktop OSes means macOS, Windows, and Linux versions for desktop devices that are actively supported by the OS vendor and receive security updates