ted.com
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TED.com is a nonprofit platform that curates short, idea-packed talks across technology, science, design, and culture. It offers thousands of TED Talks with videos, transcripts, and curated playlists, including content on public speaking, communication, and storytelling.
More resources on Impromptu Speaking
toastmasters.org
Toastmasters.org is the official site of Toastmasters International, a global public-speaking and leadership organization. It provides program and membership information, a club locator, and learning resources (including impromptu speaking tips and the Pathways education system) plus event and contest details.
mindtools.com
MindTools is a practical career-skills site offering articles, templates, and step-by-step guides on management, leadership, and communication. It includes resources on public speaking and impromptu speaking, with tips, structures, and exercises to improve delivery.