Preparing a megathread about android FOSS apps - Part Four (Keyboards, Notes, Maps and Music Players)

This thread is ONLY to talk about Keyboards, Notes, Maps and Music Players. I add video Music Players because probably some people want to know about good FOSS alternatives.

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Little context

::: spoiler spoiler Why not build a megathread with the best and most reliable FOSS apps too help someone who want to join on the bright side of open source?

We (because this is not from me, this is from us) need to share thoughts, ideas and all things you want to say. Dont be shy. Upvote the comments you like and agree; disagree and tell why you disagree. This is will be different from others threads because this need a proper user opinion, and your opinions will be VERY important to build this. In short, your opinions and thoughts will be the fundamental source to build this.

I will read ALL comments to build this. Even if this has a million comments, I’m going to waste time reading it. Whatever it takes.

Your opinions about it are CRUCIAL and FUNDAMENTAL, because your opinions is the main-base to build the megathread. :::

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Please, consider share your ideas and thoughts about apps on previous threads. Your opinions are really important to build final megathread. You can upvote or downvote posts so that comments gain strength and agreement between the community.

::: spoiler spoiler

Discussion about Contacts, SMS and Dialers app is here.

Discussion about Calculators, Cameras and Calendars apps is here.

Discussion about Manager files, Recorders, Galleries and Video editors apps is here. :::