Is there a good Web resource for transposing keys and perhaps not only transposing a key, but giving alternatives with open tunings? I'm wrestling with the song Beseme Mucho right now and some of the fingering gymnastics required are proving a real challenge. Here's the suggested chords:

Am Dm7
Bésame, bésame mucho,
Bm7b5 A7 Dm7 F° Am
Como si fuera esta noche la última vez.
A7 Dm7
Bésame, bésame mucho,
Am F E7 Am
Que tengo miedo a perderte, perderte después.

OK, I don't know what an "F°" notation is. Also, going from a Bm7b5 to an A7 is hanging me up.

Suggestions please?