A Tuner!
I used to want a tuner really badly.
If you don't want to go the vsti route, here's what I do: open up an audio editor (I used Wavelab - but all of them probably have this feature) and use the Audio Frequency Generator tool (again, may be named differently in your app of choice) and generate a simple sine wave at 440Hz (which is an A) a few seconds long.
Then when I want to tune samples in live or whatever, I just drop that bad boy in an empty slot, loop it up, and tune the clip in question as needed. Use Live's transpose setting to set the sinewave sample to different notes.
It's easy!
If you don't want to go the vsti route, here's what I do: open up an audio editor (I used Wavelab - but all of them probably have this feature) and use the Audio Frequency Generator tool (again, may be named differently in your app of choice) and generate a simple sine wave at 440Hz (which is an A) a few seconds long.
Then when I want to tune samples in live or whatever, I just drop that bad boy in an empty slot, loop it up, and tune the clip in question as needed. Use Live's transpose setting to set the sinewave sample to different notes.
It's easy!