DeckSet is great, but is quite limited in terms of allowing theme customization. If they allowed themes to be modified directly with CSS — or better, YAML/TOML/JSOn, that'd be excellent.

I've been looking very closely at Marp[1], which is a engineer-focused solution to this.

[^1] https://github.com/marp-team/marp

Only for MacOS though

I love how DeckSet looks but it only works on macOS :\