Mod dependency checker
Look up a CurseForge mod and get the full list of what it needs — dependencies of dependencies included, since that is where the second crash tends to come from.
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The second crash is the frustrating one
When a mod needs a library, the crash log tells you its name. When that library needs another one, you are finding out the tree one crash at a time, and that is where evenings disappear. CurseForge has the complete graph; its mod pages just only show you the first level. This follows the rest of it.
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Why this is Minecraft-only
On CurseForge, dependencies are structured data — each file lists the mods it requires and how it relates to them — so they can be followed reliably. uMod, where Rust plugins live, has no such field: its API gives titles, download counts and dates, and any requirements are written as prose in the description. A "Rust plugin dependency resolver" would have to guess from paragraphs, so this site does not offer one.