KeepSafe - Keep your entire photo library safely stored in an encrypted private cloud.
LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
Hide Secrets - Hide Secrets is an app that allows hiding everything they deem confidential on their smartphone.
Softros LAN messenger - LAN messenger for an internal office chat for home or business users. It does not require a server and is very easy to install and use. It supports personal chats, group chats, message brodcasting, files transfer and remote desktop access.
AppLock (FOSS) - A privacy App lock FOSS application.
MyChat - Secure instant messenger for any network