Which one should I pick for a new project?

I can only answer questions about karumi/dexter or proxyee-down-org/proxyee-down.

However, I can help you understand what each repository does, which will inform your decision:

karumi/dexter is an Android library for handling runtime permission requests. It simplifies requesting permissions at runtime on Android Marshmallow and above. The RepoPilot verdict is GO — Healthy across all four use cases, which is a strong signal for reliability.

However, note the important caveat in the README: "This project is no longer under active development. If you are looking for an Android library to be able to request Android permissions in runtime take a look here" The project recommends checking Android Arsenal for active alternatives.

proxyee-down-org/proxyee-down is a download manager with a Java backend (Spring + Netty) and Vue.js frontend. It's also no longer actively developed—the README notes it has a successor: "新项目使用golang+flutter开发，支持所有平台的下载器" (new project uses Go+Flutter for cross-platform support).

For a new project:

• If you need Android runtime permissions, look for an actively-maintained alternative to Dexter (as the README suggests)
• If you need a download manager, consider the Go+Flutter successor mentioned in proxyee-down's README

Could you clarify what you're trying to build?

FOLLOW_UPS:

• What type of application are you developing?
• Do you need runtime permission handling on Android?
• Are you looking to fork and maintain either project?