Free open source alternative app list of Android Custom ROM :

LineageOS

LineageOS is a free and open-source Android-based operating system distribution (custom ROM) for smartphones and tablets, offering long-term security updates and bundled apps like Glimpse, Aperture, Twelve and Canvas. It provides a de-Googled, privacy-respecting alternative to vendor Android builds.

FreeAndroid

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

Admin Panel

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

AdGuard

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

Ad Blocker

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

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.

Acorn 7

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