Have you implemented OpenMRS? Please participate in the Implementation Site Survey. If you already have, thank you!
Netbeans is a free, community developed opensource IDE which can be used for programming in a host of languages like Java, C/C++, Ruby, Python. Most developers from the OpenMRS community work on Eclipse IDE, but open-source means you have the choice to use your own tools and this How-To Guide is directed to developers who want to develop OpenMRS using Netbeans IDE.
Follow the steps mentioned here: Using Maven in Netbeans