ViralStat - All-in-one tool for cross-platform social video analytics
Famous First Websites - Discover what popular startup websites looked like at launch
Social Aider - Social Aider is an affordable, user-friendly social media management tool that helps businesses to enhance their marketing campaigns.
Waybackpack - Download the entire Wayback Machine archive for a given URL
YouTubeDLD - World's most efficient YouTube downloader. No spam or ads.
Youtube++ - extension to show publishing date of related youtube videos.