AutoCAD MEP - AutoCAD MEP software helps you draft, design, and document building systems.
Xmind - Xmind is a brainstorming and mind mapping application.
DataCAD - DataCAD is a computer-aided design and drafting software for 2D and 3D architectural design and drafting
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.
AutoCAD Plant 3D - AutoCAD Plant 3D is a BIM software that lets you create, modify, and manage schematic piping and instrumentation diagrams.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.