There are 2 repositories under microsoft-bot topic.
Top geek's chindogu - personal assistant over satellite/telephone/SMS/chatbot, plus web infrastructure servers (web & mail, ad-free DNS, TCP-over-DNS, web proxy, etc)
A Genesys bot framework call center handoff
Send private messages programmatically in MSTeams
Multicloud chatbot for Microsoft Teams Channel using Microsoft Bot Framework SDK v4 C#.
Enhanced SharePoint Framework (SPFx) Microsoft Bot Framework Web Chat