Wikipedia
Although it's generally not acceptable to cite Wikipedia as a source in your paper, it's a great tool for exploring topic ideas and gathering search terms.
Selecting a Research Topic
MIT Libraries covers the basics of selecting a research topic.
Choosing a Research Topic
Grinnell College Library offers in-depth advice for choosing, narrowing, and/or broadening research topics.
401 Prompts for Argumentative Writing
The New York Times features 401 ideas for research questions based on an array of contemporary issues.
How to Generate Topic Ideas for Research Papers
This article offers tips for generating research topic ideas.
How to Write a Research Proposal
This guide covers the components of a research proposal and how to write one.