We have just created a program where we list the customers that use our software and a link to their websites on a new "Customers" page. We expect to have upwards of 100 logos with links back to their sites.  I want to be sure this isn't bordering on gray or black hat link building. I think it is okay since they are actual users of our software.  But there is still that slight doubt. Along these same lines, would you recommend adding a nofollow or noindex tag? Thanks for your help.