Speare

The serious-small code editor
code runner and debugger

Features
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* Real ultra light.
* Well designed workspace management. Intuitive and concise. 
* Fast find edit points by symbol index, bookmarks or searching.
* High performance when managing large amount of files for big projects. 
* Supports 90+ programming language and document formats syntax highlighting and parsing.
* Fast search and replace in current document, selected folder, opened files and entire project.
* Smoothly edit multiple files that written in different programming languages simultaneously.
* Auto-completion and jump-to-definition across different programming languages.
* Parallel editing. Anchor one file and fast edit arbitrary files alongside another text editor.
* Real-time diff. Show coloured code block of file changes with editing actions instantly.
* Efficiently manage working on files across exit, re-launch and project switching.
* Powerful built-in code formatter (code beautifier).
* Completely leverage keyboard shortcuts for fast editing.
* Fast project switching and powerful insisted bookmark management.
* Keeping entire state after quit, the opened files, selection of each file and the cursor location.
* Built-in debugging environment for C, C++, Lua, mruby, Ruby, Python, Perl, PHP, AWK, Tcl, Java, Go, Rust, Erlang, Elixir, OCaml and Haskell.
* Syntax checking, run code and unit test instantly, nimble and unlimited extension by shell scripts.
* Full featured JSON editor, efficiently create, edit and pretty print JSON text block and files.
* Full featured Markdown and HTML5 editor and previewer, run Javascript code instantly.
* Unlimited go back and forward, automatically remember jump location and current editing locations.
* Preview all kinds of files, image, SVG, PDF, Office documents, RTF, man pages, audio and video etc.
* Fonts and colours customisation, supports self-defined schemes.

After years of continuous crafting, this app already reached a brand-new quality level.
More info: https://macspeare.com