pyLoad

PyLoad is a powerful download manager with extensive capabilities for handling downloads from diverse sources. Unlike the vast majority of download managers out there, the app targets a specific audience, namely those who are interested in handling One-Click-Hoster links, container formats like DLC, and even links from video sites.

The application doesn’t feature a sophisticated graphic interface, as it entirely coded in Python, ensuring efficient performance and resource utilization. To put it simply, it offers a range of client options, including a web interface and command line interface. The Qt-based graphical user interface was initially listed as a to-do, but it is not currently under active development. 

While it does support plugins, you need to make sure that they adhere to its licensing. Then again, any plugin lacking the specified license attribute is automatically assumed to follow PyLoad's license. 

At the same time, enforces a platform's integrity and ethical usage policy and hence, forbids plugins related to cracking, drug-related activities, illegal e-commerce, government, pedopornography, private, racist, warez, and weapon-related services. As you probably guessed, most of these restrictions and policies are designed for developers who want to create and share plugins. 

If you are looking for a lightweight, fast, reliable, and customizable download manager with a commitment to ethical plugin development, then perhaps you can consider giving this download manager a try.