Comment by rahimnathwani

Lotus Domino (the Lotus Notes server) still lives on as HCL Domino: https://www.wappalyzer.com/technologies/web-servers/hcl-domi...

San Francisco's school board still uses it: https://go.boarddocs.com/ca/sfusd/Board.nsf/Public

(Note the .nsf extension, which signifies a Notes database)