Here's a couple of FOSS keyboard alternatives in no particular order:

Unexpected Keyboard - fdroid

• GitHub Repo
• License: GPL-3.0
• Permissions:

  control vibration
  run at startup

FlorisBoard - fdroid

• GitHub Repo
• Apache-2.0
• Permissions:

  control vibration

Thumb-Key - fdroid

• GitHub Repo
• AGPL-3.0
• Permissions:

  com.dessalines.thumbkey.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Notable Extra Notes:

I've used Unexpected Keyboard and FlorisBoard and I'd say that they're great introductory FOSS apps for most users (users inexperienced to sudden changes)

• Unexpected Keyboard uses Nix in their codebase :D

• Thumb-Key is maintained by dessalines whom is a Lemmy dev

• Florisboard is starting to convert their codebase to Rust,

  • literally their commit to main yesterday:

    "Switch native code to Rust"

  so this is pretty awesome to see!!