Testbells IDE is a development environment that supports Java, Java EE, JavaFX, HTML5, PHP, and C/C++. The document summarizes the new features of Testbells IDE versions 7.0 through 7.4, including enhanced support for Java 7 and 8, Java EE 7, JavaFX, HTML5, JavaScript, CSS, PHP, and C/C++. Key features include code editing, debugging, testing, version control, and integration with tools like Maven, Jenkins and browsers.