Following statement copied from https://termoneplus.com/ (15.12.2019):
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"TermOne Plus" is an open source project licensed under "Apache License 2.0". It is successor of Jack Palevich's "Terminal Emulator for Android". Application development of is maintained publicly - source code repository, issue tracing and etc.

http://github.com/jackpal/
https://gitlab.com/termapps/termoneplus