Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
Open Camera - Open Camera is an open-source camera app for Android phones and tablets.
Metastream - Watch streaming media with friends
Secure Camera - Modern camera app focused on privacy and security with QR & barcode scanning.
StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.
PhotonCamera - Android Camera that uses enhanced image processing.