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headlines.nvim
This plugin adds horizontal highlights for text filetypes, like markdown, orgmode, and neorg.
There's this: https://github.com/lukas-reineke/headlines.nvim It's not exactly what you asked, but it helps when visual scanning the doc.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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hologram.nvim
👻 A cross platform terminal image viewer for Neovim. Extensible and fast, written in Lua and C. Works on macOS and Linux.
hologram doesn't work for you? Although, there's a bit of an issue with images disappearing and to get them back I have to replace a character in the image's link.
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I've been going down the rabbit hole of knowledge/task/time management for a long while, and ended up making my own document syntax, tree-sitter parsers, and tools built on top of that, and it's been such a crazy and worthwhile ride: https://github.com/3rd/syslang