The world of private and civilian aircraft is populated by a multitude of manufacturers, each offering a range of aircraft catering to different needs, from single-engine trainers to luxury business jets. Here are some of the most popular and influential manufacturers in this sector:

1. Cessna (part of Textron Aviation): Based in the U.S., Cessna is perhaps best known for the Cessna 172, one of the most produced aircraft in history. They also manufacture a range of other single-engine aircraft, business jets (Citation series), and turboprops.
2. Piper Aircraft: Also based in the U.S., Piper has produced iconic aircraft like the Piper Cub and the Piper PA-28 Cherokee series. They offer trainers, high-performance single-engines, and turboprops.
3. Beechcraft (part of Textron Aviation): Known for the King Air series of turboprops, Beechcraft also produces the Bonanza and Baron lines of piston aircraft.
4. Cirrus Aircraft: Recognized for incorporating modern design elements and the unique Cirrus Airframe Parachute System (CAPS) in their SR series of single-engine aircraft. They also produce the Vision SF50, a single-engine personal jet.
5. Bombardier: A Canadian manufacturer known for its luxury Global and Challenger series of business jets, as well as the Learjet line.
6. Gulfstream Aerospace: A U.S. company specializing in high-end business jets, with models like the Gulfstream G550 and the ultra-long-range G700.
7. Embraer: Originally from Brazil, Embraer has a range of regional airliners, but in the private sector, their Phenom and Legacy series of business jets are quite popular.
8. Dassault Aviation: A French manufacturer known for the Falcon series of business jets, which are renowned for performance and luxury.
9. Diamond Aircraft: An Austrian-Canadian manufacturer known for its DA series, including the twin-engine DA42. Their aircraft are modern, efficient, and often used in training roles.
10. Mooney International: U.S.-based, known for producing high-performance single-engine piston aircraft with a distinctive backward-slanted vertical stabilizer.
11. Pilatus Aircraft: A Swiss manufacturer renowned for the PC-12, a versatile single-engine turboprop, and the PC-24, a unique jet capable of operating from short and unpaved runways.
12. Tecnam: An Italian manufacturer producing a range of light sport aircraft, twin-engine aircraft, and training planes.
13. Aero Vodochody: A Czech company known for its L-39 Albatros jet trainer, which has found popularity among private jet enthusiasts and racing circuits.

These manufacturers represent a mix of legacy companies with decades (or even a century) of history, as well as newer entrants that have introduced innovative designs and technologies. Each has contributed significantly to the evolution of private and civilian aviation.