Notebag is described as 'fully keyboard-compatible note taking app that links all your knowledge and gets out of your way' and is a Note-taking Tool in the Office & Productivity category. There are more than 100 alternatives to Notebag for a variety of platforms, including Mac, Windows, iPhone, Online / Web-based and iPad. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Standard Notes or Google Keep. Other great apps like Notebag are Obsidian (Free Personal), Notion (Free Personal), Microsoft OneNote (Freemium) and Evernote (Freemium).
As easy to use as a word document or bulleted list, and as powerful for finding, collecting, and connecting related ideas as a graph database. Collaborate with others in real time, or store all your data locally.
Dendron is an open-source, local-first, markdown-based, note-taking tool built on top of VSCode. It supports all the usual features you would expect like tagging, backlinks, a graph view, split panes, and so forth.