These are links to projects from the "Usage and scripting of Vim" course of the Sofia University in Bulgaria.
The elective course includes 15(ish) lectures spread out over 4 months or so. The students have short daily assignments to practice using Vim, and, at the end, present a project of their own choosing using Vimscript.
Be advised that the projects are not necessarily directly installable as plugins -- they were built as assignments with time pressure, and "works on my machine" was an accepted condition. They might define global functions or use windows-specific paths, for instance.
Source: https://github.com/rayagrigorova/cpp_plugin.vim
This plugin includes functionality that I often needed in the Introduction to Programming and Object Oriented Programming courses.
Source: ./src/cpp_prettifier
Prettify and indent C++ code
Source: https://github.com/reo101/nix-update.nvim
Dynamically and asynchronously update attributes of fetch-like constructions in Nix
Source:
texty-office_vim_demo.mp4
Convert OOXML documents (.docx, .xlsx, .pptx) to text