Pidgin

Installation

sudo apt install pidgin pidgin-otr
pidgin&

Configuration

General configuration

• Tools > Preferences > Show system tray > Always
• Tools > Plugins > [x] OTR

Account configuration

Google Chat

Use this plugin, which you have to build yourself (which is easy):

sudo apt-get install -y libpurple-dev libjson-glib-dev libglib2.0-dev libprotobuf-c-dev protobuf-c-compiler git make;
cd ~/apps
git clone https://github.com/EionRobb/purple-hangouts && cd purple-hangouts;
make && sudo make install

Open pidgin and add an account. You will now have Hangouts as an available login protocol.