If you're looking for a writing assistant to help you find and cite sources, two tools worth checking out are Jenni and Semantic Scholar.
Jenni is an AI-powered academic writing assistant that supports multiple citation styles including APA, MLA, IEEE, Chicago, and Harvard. It has tools for editing text, managing citations and AI-powered autocomplete. Jenni also has tools for paraphrasing, rewriting and summarizing research papers. It can import .bib files in bulk and export in multiple formats, so it's a good tool for a variety of academic tasks.
Another good option is Semantic Scholar, a free AI-powered research service that lets you search for and read scientific papers from a database of more than 219 million papers. It lets you cite papers, organize them into folders and create research feeds. Semantic Scholar also offers brief summaries to help you evaluate papers, and AI-generated definitions and answers to your questions about papers. It's useful for researchers and developers, and there's no subscription required.
If you want something more integrated, Edde is an AI-powered writing and research tool designed to try to get out of your way. It includes an AI writing assistant, citation manager and a variety of tools to help you write essays and research papers. Edde supports multiple citation styles and has detailed subject guides to help you manage citations and write better. It offers free and professional tiers.