Heroic Public Speaking (https://heroicpublicspeaking.com/) is the best one in the industry. I worked with them for 6 months to develop a 45 minute keynote. When I was leading an engineering team I used the skills here on a daily basis. Michael and Amy are an absolute joy to work with, can’t recommend enough. I now do paid speaking engagements on delivering features quickly without breaking everything because of the training I received from this program.