Virtual Flange Slide Rule
Valveworks USA
Palace Rule
HaoPlay USA
Hokm (Rule)
AI-Applications
Slide
42 Company
Flange Bolt Size & Torque
Pipe Charts
Fabrication Tools Calculator
Sermech Engineers
NXL Flange Utility
Nexus Energy Technologies
Pipedata
Zeataline Projects Limited
Flange Hole Marker
LetsFab
Piping Toolbox: ASME, Fitting
Engineering Toolbox: Engineering Calculator Apps