I have designed a set of three fonts that can be used to produce some interesting titles in video (more interesting, IMHO, than just using a single font. The fonts can be downloaded from https://github.com/Pantarheon/OpenAir and here is an example of how they can be used to create a title:

OpenAir Demo - YouTube

Can you explain exactly what to download - I tried the obvious and got nowhere? the font files download with .html on the end?

On the top of that page is a list of files, and three of them have the extension .otf (i.e., OpenAirDuct.otf, OpenAirWall.otf, and OpenAirWindow.otf). Those are the fonts. You can download them individually. Or, if you want everything in that page, you can click on the white word Code on the green background, then select Download ZIP. But you really just need the .otf files. If you have Windows, you can install them by right-clicking on each downloaded .otf file and selecting Install.