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.

Anologue - Disposable online chat.

PieMessage - iMessage on Android

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

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.

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.