Sodium Plus is open source and under the MIT License, and contributions are very encouraged! Pull requests and issues will be looked at and worked on as soon we are able.
We use packwiz to manage mods and assets, so please use it for that too! Their docs are here: https://packwiz.infra.link
To package, use our custom builder tool, which can be built just like any other go program. All formats can be packaged using the bundle subcommand.
To automatically generate a mod list from all the .pw.toml files in the mods/ and resourcepacks/ folders, use our builder tool with the arguments list --markdown --output MODLIST.md, and it will generate a mod list for you in the MODLIST.md file.
We adhere to the Keep a Changelog format. See the changelog for more details.