This webtool is a database of strategies and vendors for energy efficient systems. 

This document lists multiple web based or downloadable tools that can be used for energy analyses.

This website is a fast growing news portal for energy efficiency in buildings showcasing success stories, breakthrough technology or policy updates.

This website is put together for architects with ideas on hundreds of ways to improve design for lower energy demand. 

This website lays out design process for developing an energy efficient building.

State of the art lighting research center at RPI provides all information terminologies of lighting design, strategies for efficient lighting and product reviews after experimental testing. 

DOE website with database of energy performance of buildings across US.

An online window selection tool with performance characteristics.

Research warehouse for strategies and case studies of energy efficiency in buildings.

This weblink leads to NBI website to download the standard for free.