fwiw davx5 is libre licensed and available in fdroid: https://f-droid.org/en/packages/at.bitfire.davdroid/ https://f-droid.org/en/packages/at.bitfire.davdroid/

fwiw davx5 is libre licensed and available in fdroid: https://f-droid.org/en/packages/at.bitfire.davdroid/ https://f-droid.org/en/packages/at.bitfire.davdroid/ there is also a free fork of davx5 on Play as OpenSync: https://play.google.com/store/apps/details?id=com.deependhulla.opensync&gl=US https://play.google.com/store/apps/details?id=com.deependhul... agree that it should be bundled in to the system though....