People who use OStel also use:
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ChatSecure (formerly Gibberbot)
in 5 toolboxes
add to my toolboxChatSecure (Gibberbot) is a secure chat client capable of firewall and filter circumvention, surveillance blocking and end-to-end encryption. It works with Google, Facebook, any Jabber or XMPP server, such as OpenFire or eJabberD. Unlike Blackberry BBM’s broken single key security, Gibberbot uses the Off-the-Record encryption standard to enable true verifiable end-to-end encrypted communications.
Free unlimited, private, secure messaging with your friends over Facebook Chat, Google Talk, Hangouts, Jabber, Dukgo & more! Works with Android, iPhone, Mac, Linux or PC.