Overview
VoIP.ms SMS is an Android messaging app for VoIP.ms that seeks to replicate the aesthetic of Google's official SMS app.
Features
• Material design
• Push notifications (if using the Google Play version of the app)
• Synchronization with device contacts
• Message search
• Comprehensive support for synchronization with VoIP.ms
• Completely free

Rationale
A number of people use VoIP.ms as a cheaper alternative to subscribing to a voice plan for their mobile devices.
Unfortunately, this can make sending text messages rather difficult, as the VoIP.ms SMS Message Center is clearly built as a diagnostic tool for use in desktop browsers, not as an easy way to send and receive messages on a mobile device.
VoIP.ms does provide a mobile version of this interface with an improved UI, but it still lacks important features that are only possible with a dedicated app.
Installation
The standard version of the app uses closed-source Firebase libraries to support push notifications and facilitate crash reporting and analytics, among other purposes. A version of the application that is completely open source is available from F-Droid.
Both versions are available from the Releases section of the GitHub repository.
Documentation
The app's documentation is available in the HELP.md file.
License
VoIP.ms SMS is licensed under the Apache License 2.0.