Domcomp - No-nonsense domain price comparisons, updated daily
Transferslot - Easily buy and sell side-projects
Pricepeek - Compare prices of the same product across all Amazon locales
SideProjectors - Marketplace to buy and sell side projects
dofo.com - Domain search platform Dofo.com gathers all registered (350 million) domains of the world in a single place. Dofo also brings together all the domain names that are on sale, provides useful features, all completely free.
SaaSPlace - Acquire, invest & sell SaaS products, plugins and apps