Less of an axis and more of general left-center-right, all with regards to which news outlets tend to lean one way in tone and language choice vs. another. You can select summaries of each bias to understand those choices in the app. It also helps break down a few other items of note:
While this may be beyond the scope of your efforts, it does do some solid highlighting of news sources for me.
There are a few Ground.news bots floating around Lemmy – or at least there used to be – that would comment on posts to provide some or all of the above.
I have looked for something similar. There are a number of spaces where FOSS project lists are maintained, but they are often focused on a singular topics like ‘privacy’ or something akin, and they aren’t often parts of larger lists that can be sorted based on the conditions you mentioned above.
The closest thing, if you are interested in other possible tools that might help: Alternative.to, a crowdsourced software searching tool, which has a means of filtering to show only, say, open source projects, or sort by tags that denote stacks used, languages used, etc. (see screenshot of tags I added). It has been useful enough for my own needs when looking for what you’ve been looking for.
Either way, best of luck! I haven’t been able to find something yet, myself.