熊猫搜书
The World Digital Library provides free access to manuscripts, rare books, maps, photographs, and other important cultural documents from all countries and cultures, in Arabic, Chinese, English, French, Portuguese, Russian and Spanish.
文津搜索
术语在线—权威的术语知识服务平台
苦瓜书盘是供网友交流适合电纸书阅读的6寸pdf及mobi格式电子书制作技术的网站
中国国家数字图书馆 读者门户 - 中国国家数字图书馆
时宜搜书