| IDL | 1977 | Business Data Processing | United States | Interactive Data Language | |
| IDL | 1987 | United States | Interface Definition Language | ||
| IDL | 1975 | Business Data Processing | Visualisation | United States | Interactive Data analysis Language |
| IDL | 1981 | ||||
| IDL | 1962 | Business Data Processing | Information algebra | United States | Information Description Language |