Comment by literallywho

There are so many of them, aren't there? There's Roam Research (might be the OG one), Logseq (FOSS Obsidian basically), Notion, Emacs' Org-Roam, Anytype, etc. Neovim has like 5 extensions implementing the same idea (such as Neorg), Bram's Vim probably has its own plugins in Vim9script.