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I currently use Telegram (because it just works very nicely) and WhatsApp (because stubborn people insist on using it). Both can be used on the desktop via http://web.whatsapp.com and http://web.telegram.org. Telegram also has a native desktop client for Linux.
From the security standpoint, both seem inferior to Signal (formerly TextSecure). Is there any way to use Signal on the desktop as well? I guess that would break the end-to-end encryption but I would be willing to share the key between desktop and mobile.
Possibly via bluestacks? – Jonno – 2016-01-16T12:34:24.690
@Jonno: That is remote control of an Android device? – Martin Ueding – 2016-01-16T12:47:18.917
Note that you can use multiple devices without sharing private keys. Each device has it's own key pair. Messages are sent to your main active device, and this device then forwards the messages to your other devices using their public encryption keys.
See https://signal.org/docs/specifications/sesame/