KDevelop
Netbeans
Microsoft Visual Studio
Qt Creator
Eclipse
IntelliJ IDEA
PyCharm
Xcode
Free Pascal
Lazarus
Python
Embarcadero Delphi
PascalABC.NET
Rust
PureBasic
Dev-Pascal
KDevelop Free PascalFree Pascal might be a bit more popular than KDevelop. We know about 2 links to it since March 2021 and only 2 links to KDevelop. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Never tried it: https://kdevelop.org/. Source: about 1 year ago
Since you want to become a KDE developer I suggest you use KDevelop as your IDE. Source: about 1 year ago
I used Free Pascal which I was quite impressed with. It supports multiple dialects and many targets. Source: over 2 years ago
As a tangent, I found it fascinating that Double Commander is developed with Free Pascal and Lazarus. https://github.com/doublecmd/doublecmd/wiki/Development https://freepascal.org/ https://www.lazarus-ide.org/. - Source: Hacker News / about 3 years ago
Netbeans - NetBeans IDE 7.0. Develop desktop, mobile and web applications with Java, PHP, C/C++ and more. Runs on Windows, Linux, Mac OS X and Solaris. NetBeans IDE is open-source and free.
Lazarus - Lazarus is a cross-platform IDE for the Free Pascal compiler.
Microsoft Visual Studio - Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft.
Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
Qt Creator - Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment. It is the fastest, easiest and most fun experience a C++ developer could wish for.
Embarcadero Delphi - Delphi is the fastest way to write, compile, package and deploy cross-platform native applications on Windows, macOS, iOS, Android and Linux.