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.

Pyno - Pyno is a mobile application that shows your Facebook chat history.

iMessage - iMessage is an unlimited text messaging system for the Mac OS X operating systems that provide the iOS users to send unlimited messages to other iMessage users on Mac or other iDevices for free.

AirMessage - Use iMessage on any Android phone 💬

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

Big Ass Message - The most useful single-serving site on the World Wide Web.