Top Alternatives to ChatSecure

Telegram is a free cloud-based instant messaging platform.

Tox is a peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption.

Signal is the most scalable encryption tool.

Ring (SFLphone) is an open-source SIP-compatible softphone and instant messenger for Linux, Microsoft Windows, OS X and Android.

Off-the-Record Messaging (OTR) is a cryptographic protocol that provides encryption for instant messaging conversations.

Xabber (XMPP and Jabber) is a XMPP client for the Android Operating System.

Bitmessage is a decentralized, encrypted, peer-to-peer, trustless communications protocol that can be used by one person to send encrypted messages to another person, or to multiple subscribers.

TorChat is a decentralized anonymous instant messenger that uses Tor hidden services as its underlying network. It provides cryptographically secure text messaging and file transfers.

Psi is a cross-platform powerful XMPP/Jabber client (Qt, C++) designed for the Jabber power users. Psi+ is a development branch of Psi IM XMPP/Jabber client.

Conversations is an open source XMPP/Jabber client for the Android platform.

Sicher is a freeware instant messaging application for iOS, Android, and Windows Phone. Sicher allows users to exchange end-to-end encrypted text messages, media files and documents in both private and group chats.

Otr.to is a browser based chat client.

Finch is a console-based IM program that lets you sign on to AIM, Jabber, MSN, Yahoo!, and other IM networks. It runs on Unixes. It uses GLib and ncurses.

Bit Chat is a secure, peer-to-peer, open source instant messenger with end-to-end encryption.

Zulip is a chat and collaborative software.

Disa is your new messaging hub. Conversations from different services can seamlessly be joined together, or disbanded within seconds.

Silence.im is an encrypted text messaging service.

Wickr is an instant messenger application.

Dasher Messenger provids a way to message friends.

Pidgin-Encryption transparently encrypts your instant messages with RSA encryption.