Or https://www.lazarus-ide.org/
- Decades of active development - Proven concepts (same paradigm as .Net, VB and Delphi) - Supports a lot of OS/CPU.
Edit: To get started easily with tasks like cross-compiling, getting the trunk edition, and so on, use (https://wiki.lazarus.freepascal.org/fpcupdeluxe) to perform the download and installation.