Signal

Signal is one of the most secure messaging tools in the world. This open source tool developed by Open Whisper Systems has millions of users around the world and is constantly adding improved features. As a matter of fact, even Edward Snowden praised the tool starting with its early versions. If you've never used Signal before on your smartphone, then you'll have to install the Android app on your device first. After that, you can start syncing both devices and all the shared contacts. One of the key elements in the Windows version of Signal is that it also lets you send photos, videos, and any document or file you have on your computer. Likewise, the security encryption is excellent and on your PC you can also verify the identity of all the people you talk to. With Signal for Windows, you can take advantage of all the power and performance of your computer to have end-to-end encrypted conversations. Through a simple and efficient interface, you can keep up with anything new that happens in your conversations without having to keep a constant eye on your smartphone.