JabberJaw
This is the source code for the JabberJaw Salesforce Labs listing: https://appexchange.salesforce.com/listingDetail?listingId=a0N3u00000MBar5
JabberJaw is a free instant messaging app, built entirely on Salesforce. Best used in the utility bar, JabberJaw allows quick and easy collaboration between users and a wealth of additional features!
Setup & User Guide: https://sfdc.co/JabberJaw