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Simple Mobile Tools is being sold to a for-profit firm ZipoApps
(programming.dev)
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https://f-droid.org/en/packages/protect.videoeditor/
That's a video transcoder. Simple Gallery could crop videos, trim videos, merge them, add filters, text, music and what not. Good thing it's forked by one of the devs who plans to maintain it.
It allows you to trim videos, but yes, not any other functions you mention.