KDevelop is a free software integrated development environment (IDE) developed under the KDE Umbrella. KDevelop provides support for a wide variety of languages (such as C/C++, Python, PHP, Ruby, ...) via an extensible plugin framework.
KDevelop is mostly developed by volunteers, who contribute to the project in their spare time.
If you are not able to contribute, you might be interested in donating. While these donations are not directly targeted at specific development, they help to keep the KDE community going. For example some KDevelop related coding sprints were funded by the KDE e.V. based on these donations.