Based on our record, Sciter seems to be a lot more popular than DeskGap. While we know about 23 links to Sciter, we've tracked only 1 mention of DeskGap. We are tracking product recommendations and mentions on Reddit, HackerNews and some other platforms. They can help you identify which product is more popular and what people think of it.
I don't know how "lightweight" it is but: Https://sciter.com/ may interest you. - Source: Reddit / about 2 months ago
As an author of Sciter Engine (embeddable HTML/CSS/JS engine that implements good chunk of browser functionality) I think I can qualify to answer on this question. - Source: Reddit / 3 months ago
Using things that are only offered as glibc-built dynamic libraries, like the free version of Sciter. - Source: Reddit / 3 months ago
Leaflet works as it is in Sciter too. SDK sample: https://github.com/c-smile/sciter-js-sdk/tree/main/samples/leaflet So it can be used in pretty much any native desktop application. Including desktop games that use DX11, DX12, Vulkan or Metal graphics.  https://sciter.com. - Source: Hacker News / 3 months ago
I've never tried it but DeskGap lets you build a desktop app like Electron, but it uses your existing installed version of Chrome instead of bundling it's own Chrome engine inside the app so it keeps it much more lightweight. Might be interesting for you https://deskgap.com/. - Source: Reddit / 6 months ago
Electron - Build cross platform desktop apps with web technologies
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NW.js - nwjs
NeutralinoJS - Neutralino is a lightweight application development framework.
Google Cobalt - High-performance platform that implements a subset of HTML5/CSS/JS
Qt - Powerful, flexible and easy to use, Qt will help you not only meet your tight deadline, but also reduce the maintainable code by an astonishing percentage.