Matbase
Mechanical, physical and environmental properties of materials from Delft University of Technology
MatWeb
Material property data
The Engineering ToolBox
Resources, tools, and basic information for engineering and design of technical applications
Engineers' data book
Materials handbook a concise desktop reference
Shigley's Mechanical Engineering Design TJ230 .S5 2015
Springer Handbook of Mechanical Engineering TJ145 .S67 2008
The Standard Handbooks for aeronautical and astronautical Engineers TL 551 .S664 203 (AD Reference)
Ebook Central
Safari
Springer (2005-2014 titles)