I like zig, but I really like writing C. I am starting with implementing different allocator types. I don't know how the other parts of the library will fit in, but they will certainly use the allocators.

I want a series of standard collection types with nice interfaces. ArrayLists, LinkedLists, value-based HashMaps, reference-based HashMaps.

I also want to provide snippets for generating safe bit-flags and tagged unions. This will be done with the X-macro pattern. As well as snippets I want some sort of explanation of why the snippets are made the way they are, and what value it provides to follow those patterns.

I probably want a ui library. It too wil rely on a graphical drawing interface. It will be a little different though. It is inspired from my experience with using raygui. instead of making some sort of layout engine, I will provide a set of useful functions to manipulate rectangles. I think this produces programs that are easier to reason about, while still reducing needless duplication of code. The workflow relies heavily on function-static variables, which are a c superpower in this scenario. You will essentially start with some 'fixed' rectangle (probably derived from the window size) and then perform splitting operations on that rectangle. Even a dynamic split that creates a draggable border, updating the local function-static variable (which is a normalized float) to let you resize sections.