IdentityServer - An open-source, standards-compliant, and flexible OpenID Connect and OAuth 2.x framework for ASP.NET Core
Beyond Compare - Beyond Compare allows you to compare files and folders.
DotNetOpenAuth - DotNetOpenAuth is a free-to-use compiled library that comes with the real support to your site visitor to login with the help of openIDs via getting control of the ASP.NET control onto the page.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Okta Workforce Identity - Okta Workforce Identity is utility software for enterprises that provides a new way of work that enable your employees, contractors, and partners to use technology on any device.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.