Apps similar to Athas include Notepad++, which is free and open source. Other options are Visual Studio Code, Sublime Text, VSCodium and Vim. You're spoiled for choice with Code Editors like Athas: we list more than 50 alternatives for Mac, Windows, Linux, the web and Chrome OS.
Aptana Studio is a complete web development environment that combines powerful authoring tools with a collection of online hosting and collaboration services that help you and your team do more. Includes support for PHP, CSS, FTP, and more...
United States
Koi is a fast, native code editor for macOS built around low-latency editing, local workflows, and privacy.
United States
China
CodeEdit is a code editor built by the community, for the community, written entirely and unapologetically for macOS. Features include syntax highlighting, code completion, project find and replace, snippets, terminal, task running, debugging, git integration, code review...
Germany
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A powerful IDE for data science, Zasper excels with massive concurrency support, enabling numerous simultaneous connections, minimal memory usage, and speedy performance. Suited for REPL-style data apps like Jupyter notebooks, fully supported on Mac with limited Linux support.
India
UltraEdit is a commercially maintained editor built for critical work where performance, reliability, and security matter most.
United States
PSPad is a freeware programmers editor in 8 languages for Microsoft Windows operating systems. Some features are highlighted syntax, ftp, projects and so on. Code explorer for Pascal, C/C++, INI, HTML, XML, PHP and more in development, internal web browser with APACHE support.
CzechiaEU
JetBrains Air is the Agentic Development Environment where Codex, Claude Agent, Gemini CLI, and Junie execute independent task loops without interfering with each other.
CzechiaEU
SciTE is a SCIntilla based Text Editor. Originally built to demonstrate Scintilla, it has grown to be a generally useful editor with facilities for building and running programs. It is best used for jobs with simple configurations - I use it for building test and demonstration...
Australia
With Theia you can develop one IDE and run it in browsers or native desktop application from a single source. Theia is designed in a modular way to allow extenders and adopters customizing and extending every aspect of it.
United States
Custom task and session manager using Git worktrees to organize parallel workflows, integrates with agent CLIs and TUIs through hooks and scripts, provides live agent status, automated environment setup, VM sandboxing for secure code, and session-aware automation.
United States
Leafpad is a lightweight text editor that emphasizes simplicity. As development focuses on keeping weight down to a minimum, only the most essential features are implemented in the editor.
