Use academic mode to help make sure you are getting accurate and real sources. Not all sources are guaranteed to meet the requirements of an instructor.

Limited free use with an account. Consensus is an AI-powered search engine that only searches through peer-reviewed scientific research and attempts to find the most credible answers for questions. It is useful for topics that have already been studied by scientists.
Library databases will likely have more results.

Free limited use with an account. AI-based research tool that mines for keywords/subjects, finds articles and summarizes article abstracts. Elicit can help when keywords are not perfect. Elicit will provide summaries of research articles, and extract key information from the papers. Some results will be from paywall sites-switch over to OC Library databases instead!

ResearchRabbit is an AI-powered, citation-based mapping tool for scholarly publications. Most useful for faculty or upper-division students conducting in-depth research projects.
Account required, free.

Free AI-powered tool for research from the Allen Institute for AI

Carrot2 is an "Open source search results clustering engine". Using the tools on the Carrot2 Search Engine you can view your search results as a list, a topic cluster, or a tree-map view. This tool does not require an account, and can be helpful when brainstorming similar topics.