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Below is the list of websites built with reactJS and verified by react dev tool extension, with their valuation or funding details as of May, 2020. All the funding/valuation information was obtained from crunchbase.com

npmjs - Package manager for the JavaScript programming language.- (Raised $10.6M in Funding, Accuired by github)

Adroll - The marketing platform for growing e-commerce brands- (Raised $89.6M in Funding)

Airbnb - Online community marketplace for people to list, discover, and book accommodations- (Raised $5.4B in Funding)

Asana - Manage your team’s work, projects, & tasks online- (Raised $213.2M in Funding)

Atlassian - Leading provider of collaboration software for teams with products including JIRA, Confluence, HipChat- ($4.4B Valuation at IPO)

Microsoft - office.com

Microsoft - Outlook

Bing - COVID 19 Tracker

disqus - A blog comment hosting service offering a platform for social integration, social networking, user profiles, analytics and more- (Raised $10.5M In Funding)

Cloudflare - Web performance and security company that provides online services to protect and accelerate websites online- ($332.1M In Funding)

Dropbox - Provide a home for everyone’s most important information and bring it to life- (Raised $1.7B In Funding)

BBC - A large-scale broadcasting corporation

https://www.reuters.com/

CNN Networks

New York times

Fox News

Fox News

The Guardian

The Wall Street Journal

CNBC - The recognized world leader in business news

National Geographic

https://www.newyorker.com/

Flipboard - World’s most popular social magazine- (Raised $210M In Funding)

Imgur - Image sharing service- (Raised $60M In Funding)

ShutterStock - An online platform that enables its users to find and buy images, vectors, videos, and music.- (Raised $76.5M At IPO)

Khan Academy- ($10.2M In Funding)

Netflix- (Raised $3.1B In Funding)

Amazon Prime Video

Twitch TV - social video platform for gamers where more than 100 million gather every month to broadcast, watch and talk about video games- (Acquired by Amazon for $970M on Aug 25, 2014)

Paypal - The simpler, safer way to pay and get paid.- ($46.6B Valuation at IPO)

Product Hunt - The best new products, every day- (Raised $7.5M In Fundung)

New York Times- (1.74B In Revenue (2018))

Yahoo Mail

Codecademy- (Raised $47.5M In Funding)

Udemy - Learn on your schedule- (Raised $223M In Funding)

Coursera- (Raised $313.1M In Funding)

Udaciy - Udacity provides and promotes digital education services- (Raised $160M In Funding)

Reddit- (Raised $550.1M In Funding)

Tesla

Adobe- (Crunchbase)

NFL - The National Football League- (Crunchbase)

IMDB

Hashnode - An open, friendly and conversational network for software developers.- (Crunchbase)

Paytm- (Raised ₹2.2B In Funding)

Discord - Easiest way to communicate over voice, video, and text- (Raised $279.3M In Funding)

Docker - Docker develops an open platform for building, shipping, and running distributed applications.- (Raised $307.9M In Funding)

Indeed- (Raised $5M In Funding)

Walmart- (Crunchbase)

Flipkart- (Acquired by Walmart for $16B on May 9, 2018)

lyft- ($24B Valuation at IPO)

Pinterest - A visual bookmarking tool for saving and discovering creative ideas- (Raised $1.5B In Funding)

Stripe - Payment Gateway- (Raised $1.6B In Funding)

Twitter- ($24.6B Valuation at IPO in 2013)

Uber - Develops, markets, and operates a ride-sharing mobile application- ($82.4B Valiaion at IPO in 2019)

Medium - Social publishing network that connects ideas and perspectives on topics that matter- (Raised $132M In Funding)

Quora - Q&A platform with a mission to share and grow the world's knowledge- (Raised $226M In Funding)

Vimeo - world’s leading professional video platform

Dailymotion - leading destination for video discovery and exploration- (Acquired by Vivendi for €285M on Jun 30, 2015)

Zomato - platform designed for customers to search and discover great places to eat- (Raised $914.6M In Funding)

Codesandbox

Stackblitz

https://codepen.io/

Make My Trip - Flight Booking

SkyScanner.com - Flight Booking

GoIBIBO - Flight Booking

https://www.hulu.com/

https://stream.osn.com/

Godaddy - An internet domain registrar and web hosting company facilitating online businesses.- (Raised $460M At IPO in 2015)

Namecheap.com - Namecheap is an ICANN-accredited domain registration and web hosting company based in Los Angeles, California.- (Crunchbase)

Netlify - A unified platform that automates code to create high-performant, easily-maintainable sites, and web-apps.- (Raised $97.1M In Funding)

kickstarter - A crowdfunding platform for creative projects such as movies, music, art, theater, games, comics, design, and photography- (Raised $10M In Funding)

Weather.com

TripAdvisor - travel site that enables travelers to plan and book their trip- ($3.3B Valuation at IPO)

Glassdoor - Job and recruiting sites that operates online jobs and career community.- (Acquired by Recruit Holdings for $1.2B on May 8, 2018)

Facebook

Instagram

Whatsapp Web

Giphy

And many more...