Mcassetdownloader is a simple C# console application used to download Minecraft assets directly from Mojang servers and pack them into a resource pack zip archive.
Run Mcassetdownloader.exe [version] [target zip path], e.g. Mcassetdownloader.exe 1.16.3 resources.zip to begin the download and packaging. If the archive already exists, you'll be asked whether you want to overwrite it. The process might take a while, depending on your network and machine speed.
Note, that the program might use a lot of RAM. In my tests the usage never reached 500 MB, though. Also note, that there's basically no error handling, so if anything goes wrong, bad things may happen.
So, I guess I need a license for this, eh? Let's go with MIT License, see LICENSE. Also, this program uses Newtonsoft.Json for JSON parsing.