Pipe Flow Software (PipeFlow.com) is a trading name of Daxesoft Ltd, a UK company that has sold engineering software online since 1997. It develops and sells pipe flow, pressure drop and pump calculation software, delivered through free-trial downloads and online licence purchase, and is used by engineers in over 100 countries. The company was founded by David Gardiner in 2004, and he and his father John previously built bespoke engineering selection software for pump, valve and compressed-air manufacturers.