The best open source alternative to Notepad++ is Geany. If that doesn't suit you, our users have ranked more than 100 alternatives to Notepad++ and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Notepad++ are Kate, Vim, VSCodium and gedit.
Builder is an actively developed Integrated Development Environment for GNOME. It combines integrated support for essential GNOME technologies such as GTK+, GLib, and GNOME APIs with features that any developer will appreciate, like syntax highlighting and snippets.
Lightweight multi-platform code editor with hardware-accelerated GUI, customizable minimalist interface, syntax highlighting for 50+ languages, terminal and LSP support, plugin extensibility, unlimited editor splits, persistent project state, and portable, ad-free use.
Notepad more focused on developing than just scribble down notes.
These is not an exhaustive feature list, but gives you some idea of the features present in Programmer’s Notepad.
Textadept is a fast, minimalist, and ridiculously extensible cross-platform text editor for programmers. Written in a combination of C and Lua and relentlessly optimized for speed and minimalism over the years, Textadept is an ideal editor for programmers who want endless...
Experimental Sublime Text clone. The Backend is written in Go (Programming Language). If you are fluent in go, go ahead fork the projekt. This project is at an early stage. It is a chance and a challenge.
SynWrite is a free source code editor and notepad replacement for Microsoft Windows Operating Systems.
A simple text editor for the Xfce desktop environment. Mousepad aims to be an easy-to-use and fast editor for quickly editing text files, not a development environment or an editor with a huge bunch of plugins.
ReText is a simple text editor for Markdown and reStructuredText documents with syntax highlighting and optional live preview.
High-performance terminal text editor developed in Rust, offering fast startup, low latency, extensibility, customizable keybindings, menu-driven native UI, robust mouse support, powerful command palette, cross-platform support, and syntax highlighting.
Light Table is a new interactive IDE that lets you modify running programs and embed anything from websites to games. It provides the real time feedback we need to not only answer questions about our code, but to understand how our programs really work.
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It doesn't have many of Notepad++'s features. But for most of the basic functionality, it's a great alternative.