Tools to help with Minecraft modpack development in 1.16.5 (currently).
Snippets -- Snippet files that support auto-complete for both vanilla and modded resources, such as block and entity IDs. More to come. The correct syntax for invoking a snippet is @<modID>/. You'll then see options such as @minecraft/blocks/ or @minecraft/entities/ to allow you to select the correct auto-complete list.
JSON Validation -- Schema to help with manual JSON editing during datapack creation or modpack configuration. Schemas are automatically applied based on folder path.
For a list of currently supported mods, please see the project's wiki.