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Trillian seems serious about security and privacy, and is ready to explain in detail how they architect their service to achieve these goals.
Pro Native clients for Windows, Mac, Linux, iOS, Android, and Web.
Trillian has fully native apps for Windows, Mac, Linux, iOS, Android, and Web.
Pro Self-Hosting available
If you are worried about third-parties getting access to your data you should consider self-hosting. With self-hosting you are in control over where your data is stored, who has access to it. You will also not be vulnerable to exploits of a third-party provider. Trillian supports both cloud hosting and a self-hosted Trillian Server.
Pro Multi-protocol support
Chat with other Trillian users or those on Facebook, Google, AIM, ICQ, XMPP, Yahoo!, Twitter, and more.