toastmasters.org
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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.
More resources on Impromptu Speaking
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.
ted.com
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.