The Steelcase Furniture Symbol Library (FSL) is a free space planning software package. Flaticon, the largest database of free vector icons. Download over 14,439 icons of library in SVG, PSD, PNG, EPS format or as webfonts. Go to the main Downloads Section for downloading the other versions (including the version for single-board PCs), offline documentation, case studies, SDKs, and other resources.
Download AggreGate SCADA/HMI This page is for downloading the 32-bit Windows and Linux versions of AggreGate SCADA/HMI only. Here is the online interactive demo - a simple BAS (building automation system) screen.
All symbols are standard Silverlight controls, 100% scalable, some provide animation capabilities.
CSWorks has a free HVAC symbol library, it comes as part of the installation package.