I first heard about Jigsaw long ago but have only started actively working with it recently - and it brings excellent results in providing lists of potential passive candidates. Jigsaw is free to use as long as you enter a small amount of new business contacts into it monthly (which is not hard to do).
I've also learned to run the info I get there "through" LinkedIn, to narrow down the target email lists (I would be glad to explain this trick to those who wish.)
I've used Excel and Capture! to help form the lists.
I recommend trying Jigsaw; take a look at
enter your contact info
and then make sure you click on the confirmation email when it arrives.
I am open to sharing some useful ways to get loads of leads within a short timeframe.
If you dislike it for some reason I would be interested to hear from you too.
Brain Gain Recruiting