LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
KeepSafe - Keep your entire photo library safely stored in an encrypted private cloud.
MyChat - Secure instant messenger for any network
Hide Secrets - Hide Secrets is an app that allows hiding everything they deem confidential on their smartphone.
Output Messenger - Secure instant messenger app for office provides seamless instant messaging solutions for all office, corporate and enterprise business communication needs.
AppLock (FOSS) - A privacy App lock FOSS application.