Also known as map hacking, this is a website or web application that combines content from more than one source; a tool overwhelmingly suited to geographers. Google Maps Mania is free. You might find Ting (2009) Access to Knowledge 1, 2, helpful.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。