I'm looking for an a visual editor for the reveal.js library that meets these requirements,
LibreOffice Impress is a full presentation designer and presentation tool that can also export to impress html presentations, similar to reveal.js and some argue superior, presentations, (and more), if desired.
- Gratis - Yes
- GUI - Yes Full GUI for both presentation design and performance
- Windows 10 - Yes & Windows 7/8, OS-X & Linux
- Very similar to slides.com - Not exactly as it runs on your local machine but judge for yourself
- No restrictions Yes you can give as many public or private presentations as you like including commercially.