Chatterino on Linux

AppImage

Chatterino (unfortunately) is not available in most package managers. However, there is an AppImage which should work on most systems. You can install it by typing the following into your terminal:
cd /usr/local/bin
sudo bash -c "curl https://chatterino.com/download/Chatterino-x86_64.AppImage > ./chatterino"
sudo chmod +x ./chatterino

AUR

There is an aur package which builds chatterino from scratch. link here

Building from source

If the above don't work, then you can try this guide to build it from source.