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Yelp is an American company that operates a crowd-sourced local business review and directory platform. Founded in 2004 by Jeremy Stoppelman and Russel Simmons and headquartered in San Francisco, it publishes user reviews, ratings, photos and business information and provides reservation, ordering and advertising tools for merchants.

Upwork is an online talent marketplace operated by Upwork Global Inc. that connects businesses with freelance professionals for short-term and long-term projects. The platform offers job posting, proposals, time tracking and escrow payment services and was formed from the merger of Elance and oDesk.

TeePublic is an online print-on-demand marketplace where independent artists can upload designs for products such as apparel, accessories, and home goods. TeePublic handles product printing, fulfillment, and shipping, while artists earn royalties on sales.

Product Hunt is a community-driven website that surfaces, reviews, and ranks newly launched tech products, apps, and hardware. It was founded by Ryan Hoover in 2013 and was acquired by AngelList in 2016; the site hosts daily product listings, discussions, and maker-focused events.

Craigslist is an online classifieds website founded by Craig Newmark that provides local listings and forums across categories including jobs, housing, for sale, services, community, and events. It is operated by Craigslist, Inc., a private company based in San Francisco and serves local communities worldwide.