Geany is a lightweight integrated development environment. It was designed to be fast and small with a relatively short list of external dependencies. Geany presents a graphical interface reminiscent of heavier-weight editors for Windows-like Programmer's Notepad or Notepad++. Despite its small size (the Windows executable is only 14 MB), Geany supports editing multiple simultaneous documents, auto-completion of functions and variables, code folding, and syntax highlighting for numerous programming and markup languages. It understands CSS, HTML, Javascript, Markdown, PHP, Python, reStrutcturdText, SQL, and many others. Geany has a plugin system that can extend the base editor with additional features. Several dozen plugins are available on the Geany website, adding support for things like in-editor debugging, Git integration, preview of HTML documents, and more. Geany is a free software available under the GNU General Public License. Source code is available on GitHub. Installers for Windows and macOS are available on the Geany website. Most Linux distributions and BSD descendants include Geany installers in their package management systems.