Don Ho is a software developer known for creating the popular text editor software called "Notepad++." Notepad++ is a free and open-source text and source code editor for Windows environments. It supports syntax highlighting for a wide variety of programming languages and offers features like tabbed editing, find and replace with regular expressions, and code folding, among others. Don Ho developed Notepad++ with the goal of providing a lightweight yet powerful text editor tailored to the needs of programmers and developers. The software has gained a significant user base and is widely used in the programming community.