ScrapeBox and UCWS are both auto comment poster.They are mutlithreaded application which can post comments to blogs.Blog comments has been one of the easiest ways to gain backlinks.But in the numbers game its very difficult to keep commenting manually.

Scrapebox and UCWS both are priced at $99.But we would suggest going with Scrapebox because of the developers keen eye for support and listening to customers concerns while upgrading the softwares

Both are one time purchases, they are NOT a membership program. The purchase price entitles you to run one copy of the software indefinitely, any bug fixes and minor upgrades are completely free for owners.