I recently joined a new company that has a lot of Enterprise Architecture artifacts, standards, and reference architectures in place. I’m wondering — is there a reliable open-source or free EA tool that you’d recommend for managing and organizing these? Also, do any of you use SharePoint as a repository for EA artifacts, or are there better tools you’ve found helpful?

Archi (https://www.archimatetool.com/) is a pretty mature open source tool for modeling. However, it has a pretty steep learning curve.  Sharepoint is a good starting point for sharing and managing documents that does not need another specialized storage and access mechanism.

SharePoint is certainly a place to start to keep them organized. We are using SAP LeanIX, which is neither free nor open-source. (We started before SAP bought LeanIX) It is great! But it's more of a solution architecture tool than an EA tool, IMO. For example, while there are "Objective" fact sheets, there are no "Standard" fact sheets.  It's been great for getting a handle on our environment and helping us roadmap from current to future state. I hear they are working on an ARB capability, which will really interest me.