mindtools.com
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MindTools is a practical professional-development site offering articles, tools, and templates on leadership, communication, and presentation skills, including strategies to overcome stage fright and deliver confident presentations.
More resources on Overcoming Stage Fright
toastmasters.org
Toastmasters.org is the official site of Toastmasters International, a nonprofit that helps people improve public speaking and leadership skills through local clubs and a structured education program. It offers joining information, the Pathways learning paths, speaking tips, resources, and events to practice and overcome stage fright.
ted.com
TED.com hosts thousands of talks on ideas across science, technology, design, and more; you can watch videos, read transcripts, and explore curated playlists to develop public speaking skills and strategies to overcome stage fright.
Dynamic Public Speaking
Coursera course: Public Speaking and Presentations