Free open source alternative app list of DevExpress :

SunnyUI

SunnyUI is a free, open-source C# WinForms UI control library offering a rich set of modern controls and themes for building desktop applications. It serves as a lightweight alternative to commercial WinForms component suites.

FreeWindows

Others are looking for free open source alternatives of following apps:

Ad Blocker

Ad Blocker is a browser tool that removes intrusive ads and pop-ups from web pages.

Acorn 7

Acorn 7 is a Mac image editor for editing photos and creating graphics.

Admin Panel

An admin panel is a web-based interface for managing application data, users, and settings.

AI / LLM Inference

AI/LLM Inference delivers fast, scalable deployment of large language models for generating AI responses.

Adobe Premiere Pro

Adobe Premiere Pro is a professional video editing software for film, TV, and web.

AdGuard

AdGuard is a cross-platform ad blocker that filters web content and protects privacy.