There are 2 repositories under twincathmi topic.
Unofficial changelog for TwinCAT
Collection of TwinCAT projects used for my blog posts at cookncode.com/twincat
Sample extensions for the TF2000 TC3 HMI Server
Client samples for the TwinCAT HMI
A guide to running TcHmi on multiple screens in kiosk mode
Engineering samples for the TwinCAT HMI
TwinCAT HMI sample code for an extended TcHmiTextbox that includes popup keyboard options and input validation
TwinCAT HMI sample code for a motion indicator control mimicking a rotating cylinder or moving conveyor belt.
Crawler for Beckhoff's InfoSys
Simple demo creating a csv export from the event logger
A guide to modifying css on a textbox via JavaScript