Features of Music Sleep Timer Plus:

- Set timers by specific time or duration
- Extend the timer directly from the notification drawer

Screenshots of Music Sleep Timer Plus:

Installation
The working app "SSTV Encoder" can be installed
on Google Play:
https://play.google.com/store/apps/details?id=om.sstvencoder
or on F-Droid:
https://f-droid.org/packages/om.sstvencoder/
SSTV Image Decoder
Open Source Code:
https://github.com/xdsopl/robot36/tree/android

Installation
The working app "Robot36 - SSTV Image Decoder" can be installed
on Google Play:
https://play.google.com/store/apps/details?id=xdsopl.robot36
or on F-Droid:
https://f-droid.org/packages/xdsopl.robot36/

Open Source code:
https://github.com/xdsopl/robot36

Screenshots of Encoder and Decoder

Screenshots Of Seanime