I recently started an online game as White that began as follows.
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
1. Nf3 f5 2. d3 Nc6 3. e4 e5
Here I deliberately decided to lose a tempo with 4. d4 and transpose into a Vienna reversed with the Black pieces. I knew what I was doing and therefore was able to avail myself of various resources (books/databases) on the Vienna game, but this got me to wondering. Are there any databases against which you can enter a position, and it will also look for the reversed position?