There's plenty of pitch tuning software out there, most of them reserved for guitars, crashing on startup, or payware.
So to have found one that doesn't crash and is free for use, unless you feel like donating some money, is a great boon on its' own. To then find that it works quite perfectly for my trumpet, even though somebody mentioned it doesn't bode well for acoustic instruments.
The reason I had downloaded this piece of software was to check which pitch my several didgeridoos were tuned for. This the software, not surprisingly, had some trouble with those, but by keeping my tone as pure and unwavering as possible was still able to give me a good indication.
I tested this by having my conductor lend me his pitching hardware the same evening to double-check the two didgeridoos that were in a pitch that was usable for a certain piece of music.
So, in the end, seeing as a professional piece of hardware had no trouble deciphering the pitch of a didgeridoo I can't in honesty rate this software as perfect, but it came quite close, if you're asking me :)