Here is a list of amazing tools to promote your startup online. I know, I know... there is ProductHunt.com but if you're not ready for PH you can start here:
Find Better Software Alternatives
AppRater - Curated mobile apps every single day
B2B Listings | A Human-Review B2B Directory
Betabound - We collect, organize, and offer great testing opportunities.
BetaPage - Community of tech lovers and early adopters