What was the first third-party commercial application for MS-DOS intended for IBM PC-compatible computers?
There were several first third-party commercial applications for MS-DOS (well, PC DOS really), since a number were launched on the same day as the original IBM PC:
- Microsoft’s extended BASIC interpreter;
- Microsoft Pascal;
- Peachtree’s accounting suite;
- an asynchronous communication package.
There was also a game available on launch day, Microsoft Adventure, but it didn’t target DOS.
The Microsoft programs probably don’t count as third-party, but that still leaves VisiCalc, EasyWriter, and Peachtree, at least. (I think the communications package was written by IBM.)
Some of these were ported from other platforms, so arguably they’re older — VisiCalc was released in June 1979 on the Apple II, EasyWriter was also released in 1979 on the Apple II, and Peachtree’s lineage starts on the Altair in 1977.