Anologue - Disposable online chat.

Discord History Tracker - Discord History Tracker is a great tool that enables you to select chat history and save it in your private conversations, servers, groups, and then view it anytime without needing an internet connection.

Smarsh Instant Messenger - smarshIM Mobile is a free application download that requires a paid account on the smarshIM service...

PieMessage - iMessage on Android

Worlize - Worlize is the platform that allows users to communicate with each other in a fun way and play games that are created by the users on this platform.

Discord Chat Exporter - Discord Chat Exporter is a useful and open source solution that makes it easy for you to export Discord message history from any channel and then view it offline.