CH2M HILL Companies, Ltd., also known as CH2M, was an engineering company that provided consulting, design, construction, and operations services for corporations and governments. The company was organized in Delaware and headquartered at 9191 South Jamaica Street, Englewood, Colorado.[1] In December 2017, the company was acquired by Jacobs Engineering Group. The company played a major role in the Panama Canal expansion project.[2] The company developed, maintained and published its own method for managing projects for clients, called the CH2M Hill Project Delivery System.[3] The firm was named from the initials of its four founders.

Fluor Corporation is an American multinational engineering and construction firm headquartered in Irving, Texas. It is a holding company that provides services through its subsidiaries in the following areas: oil and gas, industrial and infrastructure, government and power. It is the largest engineering & construction company in the Fortune 500 rankings and is listed as 164th overall.[2] Fluor was founded in 1912 by John Simon Fluor as Fluor Construction Company. It grew quickly, predominantly by building oil refineries, pipelines and other facilities for the oil and gas industry, at first in California, and then in the Middle East and globally. In the late 1960s, it began diversifying into oil drilling, coal mining and other raw materials like lead. A global recession in the oil and gas industry and losses from its mining operation led to restructuring and layoffs in the 1980s. Fluor sold its oil operations and diversified its construction work into a broader range of services and industries. In the 1990s, Fluor introduced new services like equipment rentals and staffing. Nuclear waste cleanup projects and other environmental work became a significant portion of Fluor’s revenues. The company also did projects related to the Manhattan Project, rebuilding after the Iraq War, recovering from Hurricane Katrina and building the Trans-Alaska Pipeline System.

Let’s Encrypt is a free, automated, and open certificate authority (CA), run pro bono as a nonprofit organization. It is a service provided by the Internet Security Research Group (ISRG). Let’s Encrypt provides the public with digital certificates necessary to enable HTTPS (SSL/TLS) for websites, for free.