Currently I'm maintaining a PowerShell-Module called ACME-PS - it's an implementation of an ACME (the protocol behind Let's Encrypt) purely written in PowerShell.

Next "big thing" will be a ACME compliant server written on .NET Core, meant to connect the ACME protocol with the windows world, so you can start creating internal certficates from your beloved Active Directory Certficate Services via ACME - and thus any compliant client.

Also I'm always digging into other peoples source code and try to provide useful issues from the point of view of my primary employer the University of Mainz (besides that, I'm part-time self-employed), where I'm working as head of software-development. There I'm responsible for some web application servers as well as the single-sign-on infrastructure based around ADFS, Shibboleth IdP and IdentityServer.