Caption This - Create a smart caption for your photo in a second!
Zubtitle - Zubtitle is an online tool that makes it easy to add captions to any video.
Quik by GoPro - Easiest way to create awesome videos
VEED Subtitle - A simple & fast way to add subtitles to your videos online
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Streamlabs Podcast Editor - Streamlabs Podcast Editor ― Edit Your Video By Editing Text