I have used Traffic Travis but it can be very limited using the free version. Market Samurai seems to be a decent one for the free version to use, but can sometimes give out misleading KW phrases when I dug deeper on some niches.
I have not tried Long Tail Pro so I can not give an honest answer for that software. Nor have I tried out Wordtracker.
Jon does have a product like Buxykay mentioned with his answer, and I second that motion that you should watch the video to see how it works. There is also a trial version for $7.00, so you can actually test it against what the video says it can provide for keyword research possibilites.
Welcome to the forum and I look forward to seeing more interesting questions that I can try to help you with.
I hope my answer helps to answer your question further