WinDev is described as 'Integrated software for developing cross-platform applications' and is an app in the Development category. There are five alternatives to WinDev for a variety of platforms, including Windows, Linux, Mac, Android and iPhone. The best alternative is Lazarus, which is both free and Open Source. Other great apps like WinDev are Delphi (Paid), B4X (Freemium), Xojo (Paid) and B4J (Free).
Lazarus is a cross-platform IDE for the Free Pascal compiler. It tries to offer a Delphi-like programming experience through its own 'Lazarus Component Library' and supporting many platforms like Windows, OSX, Linux, BSD, Android, iOS and more.
Embarcadero Delphi, formerly CodeGear Delphi and Borland Delphi, is a software development environment for Microsoft Windows applications originally developed by Borland and now owned and developed by Embarcadero Technologies.
Cross platform development tools for native iOS, Android, desktop and server applications. B4X is a Rapid Application Development (RAD) tool for real world apps. The programming language is a modern version of Visual Basic.