Development Tools in 2006: any Room for a 4GL-style Language?: An independent study by Jean Georges Perrin, IIUG Board Member: Perrin, Jean Georges: 9781520263625: Amazon.com: Books
New IDC Top Line report - 4GLs more prevalent than you think - Genero software development platform low-code no-code
Command line tools
UNICOM Systems TeamBLUE :: PowerHouse® 4GL
progress-4gl Tutorial => Application Compiler
Extending Informix 4GL Programming Capabilities Using FourGen® CASE Tools. - ppt download
Extending Informix 4GL Programming Capabilities Using FourGen® CASE Tools. - ppt download
Why most visual development / 4GL tools fail? – Part 1 | Suresh Sambandam's Blog