Ferrite
A fast, lightweight text editor for Markdown, JSON, YAML, and TOML
...It focuses on common “config and docs” formats like Markdown and popular structured data files, so it fits naturally into developer, DevOps, and technical writing workflows. The editor is designed around responsiveness and low overhead, prioritizing quick startup, smooth scrolling, and predictable editing even when you are jumping between many small files. It also aims to reduce friction when reading and tweaking structured documents by offering format-aware conveniences and a UI that stays out of the way. Ferrite positions itself as a pragmatic daily driver for notes, documentation, and configuration edits, especially when you do not need a full language server stack.