Fewer companies develop tools for Mac users, but I found one tool that I can recommend – Optitools. The cost of $149 and a 90-day guarantee is attractive. Another option you my consider is the Online Backlink Builder. While neither of these tools provides everything PR Prowler does, they do help with the search of good link candidates.
As seen my monthly column in the December 2005 issue of Practical eCommerce magazine.