I’ve been using the STM32F405 for some of my projects. To make it easier to figure out which I/O pins I wanted to use for a certain project I created a spreadsheet with the possible alternate functions from the data sheet. The first sheet lists pins grouped by which port (PA, PB, etc) it is connected to. The next sheets lists pins ordered by pin numbers for all packages. Two more sheets only list the the pins present on the LQFP64 and LQFP100 packages.
I created spreadsheet by hand, so there will most probably be some errors in it. If you find any errors, please send me a mail and tell me so that I can fix them.