Twidere is a great Free Software Twitter client for Android that also works with identi.ca. The identi.ca server must be configured manually however in order to do this. The below instructions work with Twidere 0.2.1.
- Tap the accounts tab (fourth icon from left with multiple human silhouettes)
- Tap the ‘+’ button top right to add a new account
- Tap the server icon top right next to the spanner icon to configure the server
- Change the REST Base URL to https://identi.ca/api
- Set the Auth Type to ‘Basic’
- Tap OK
- Enter your identi.ca username and password
- Tap ‘Sign in’
That’s it! Good luck.