This is Flowchart Boss – a flow charting app with built-in self-paced teaching using only those symbols that appear in the Pearson T-Level. No login, no cost, no limitations: just visit https://flowchart.toolsforteaching.co.uk
As always, this is available under the Creative Commons NC-BY-SA 4.0 International LIcense.
GitHub Link: https://github.com/SimonRundell/flowchart