SAM.gov (System for Award Management)

USAspending.gov is the U.S. government's official open-data website for federal spending, operated by the U.S. Department of the Treasury. It publishes searchable data and visualizations on federal awards (contracts, grants, loans and other financial assistance) and recipients to provide transparency and meet reporting requirements.

GovDeals is an online auction marketplace operated by GovDeals, LLC that enables government agencies and educational institutions to sell surplus assets, seized property, and other used equipment via no-reserve auctions. The platform primarily serves public sector sellers in the United States and provides a venue for buyers to bid on listed items.

ServiceTitan is a cloud-based business management software platform for home and commercial service contractors, developed by ServiceTitan, Inc. The platform provides scheduling and dispatch, estimating, invoicing and payments, CRM, mobile technician apps, and reporting to support field service operations.

BizBuySell is an online marketplace that lists businesses and franchises for sale in the United States. It provides searchable listings, business valuation resources, and tools to connect buyers, sellers, and business brokers.

Cal.com is a scheduling software platform that provides customizable online booking and appointment management for individuals, businesses, and developers. It is developer-focused and offers an open-source codebase with options for self-hosting or using hosted plans, plus integrations and embedding tools for adding scheduling into applications.