Lazarus

Lazarus is an Integrated Development Environment (IDE) for Free Pascal programming language.
This IDE provides a great tool for Free Pascal programming.

It's similar to Delphi IDE when Borland was in charge of it. It’s a Multilanguage program and it allows establishing the interface language since the installation process. It uses Free Pascal and it provides the possibility to import Delphi files, like units, projects and packages.
This IDE is sorted and distributed in windows, allowing to have as many windows opened as it needs according to the project/code.
If you like code blocks, you can take advantage of code templates to allow checking or reviewing code syntaxes, structures and definitions of the Free Pascal language. Moreover, you can grab several packages from the developer's site and forum.
As any good IDE it provides object inspector, source editor, watch window, Code Explorer, Code Browser, ToDo List, and many others helpful tools that makes easier the programming task and the details code control. Its environment, Editor, Codetools and Debugger are fully customizable.