If you need a completely free tool, you can use FontLab Pad for typesetting color fonts or FontForge for a fully free, open-source font editor.

Be careful with sites claiming to offer free "pre-activated" or "crack" versions of FontLab, as these are often malicious. To help you get the right tool, let me know:

I can also guide you to the specific tutorials for the latest version if you are just getting started.

The 10-day trial is fully functional and includes all capabilities for designing variable, OpenType, and color fonts, making it the best option to test the latest software, which serves as the successor to 2022-era versions.