Web Content Management Software Resources

Craft CMS is not fully open source, but it is based on open-source technologies and is distributed under its own license. This means: The source code is publicly viewable. You can view the code on GitHub and even suggest changes. You cannot freely modify and redistribute the code. You need a license to use Craft CMS in a project. There is a free version for personal use. However, this version is limited and not suitable for most commercial projects. Craft CMS therefore offers a mix of open source principles and a commercial licensing model.

MadCap Flare is not cloud-based per se. However, MadCap Central recently enabled cloud-based authoring that syncs up with Flare. Here's the link to their documentation about it: https://documentation.madcapsoftware.com/central/Content/Central/Introduction/Whats-New/Whats-New-Authoring.htm.

Yes, both are almost same