Question: I need a service that allows me to learn at my own pace, with options for reading, listening, or downloading content.

If you want a service that lets you learn at your own pace with options for reading, listening and downloading material, Coglayer is a good option. It can generate material tailored to your learning needs, with controls to set output length, consume content in different formats (reading, listening, download, share), and even convert text into audio. The system spans a broad subject matter, so you can find something that's useful and tailored to your needs.

Another good option is Khan Academy, a free, nonprofit online learning site. It has a broad library of materials for subjects like math, science, reading and language arts and test preparation. Khan Academy is designed to let you learn at your own pace, so it's good for students and teachers.

YouLearn is another option. It's an AI-powered tutoring service that lets you learn from a variety of content sources like PDFs, videos and slides, summarizing and answering questions immediately. It's got chat, summary and chapter outline abilities, and tiered pricing plans for different levels of use.

If you want something more interactive, Knowt turns notes into flashcards and practice quizzes. It offers unlimited free learn mode, practice quizzes and spaced repetition, so you can drill and review material. Knowt also can import Quizlet sets and create flashcards from lecture videos and notes, so it can be a good way to optimize your learning.