> I recall creating GUIs in Lazarus/FreePascal was really easy and an enjoyable experience, however there are so few libraries and integrations for it, that it's a non starter for new projects.
Lazarus and Free Pascal are used for new projects all the time, if anything judging from the mailing lists, they are more popular than they've ever been (hell, unlike only just 5-6 years ago, i rarely see people mention that they remember using Turbo Pascal back in their school years whenever a new release is made nowadays :-P).
Free Pascal comes with a ton of bindings out of the box, but making new ones for C should be simple with the included h2pas tool (i think there is also a frontend for Lazarus though i never used it myself). There should also be already made bindings for stuff that aren't distributed with Free Pascal. You should also be able to use Rust libraries by going via cbindgen -> h2pas, as well as any other language that can "export" C header files for FFI. Beyond that you can do it manually, which can be a pain, but that is the case with pretty much any language.
Of course using libraries from scripting languages and managed languages like Python, JavaScript, Java and C# is harder but not impossible (and not really that much harder than using them from any other native language, C included).
