Founded in 2008 in the United States, nopCommerce is the most mature open-source e-commerce platform built on ASP.NET Core. Completely free, plugin-extensible, multi-store capable, with over 60,000 active installations worldwide.
DNN (DotNetNuke) is an open-source .NET CMS that originated in 2002, deeply integrated with the Microsoft stack, with built-in native multilingual support and granular permissions, plus 1000+ extensions in its marketplace, ideal for enterprise portals and intranets.
Arvixe is a US hosting provider founded in 2003, known for Windows/Linux dual-platform plans, unlimited hosting, and a 30-day refund, supporting both ASP.NET and PHP.