访问结构、CCDC 和 FIZ 卡尔斯鲁厄晶体数据库
World biggest cristal structures repository. For each organic crystal, get its chemical diagram and an interactive 3D model view of
资源
图书馆、数据库、存储库、分类广告
学术 Torrents 搜索和存储库
Torrent files repository and directory of scientific and educational resources: Academic Torrents is a community-maintained distributed repository that facilitates the scalable
VIAF名称权威记录搜索
虚拟国际权威数据库（VIAF）是一个国际合作项目，它整合了来自50多个国家的名称权威记录。
dblp 计算机科学期刊搜索
最完整的计算机科学期刊和研究论文元搜索：dblp 计算机科学书目是专门的参考资料
Wolfram Alpha 科学参考计算
Provides engineering information and problem solving techniques and maths, all powered by a powerful search engine: WolframAlpha functions as a
OSINT框架（OSINT资源目录）
OSINT框架是一个组织结构良好的OSINT资源目录，它按树状结构进行分类，整合了在线工具、命令行、软件包和相关信息。
免费SVG地图
A lot of free SVG maps of world, countries or regions, ready to be downloaded and used on any website
Matweb 材料属性数据库
By fast the most complete freely accessible material properties database. For metals, plastics, ceramics, and composites, although plastics is where
金属性质数据库
A must for any mechanical calculation or simulation. Chose a standard metal designation (ASTM, ISO, EN …) and the tool
工程类 IRC 聊天室 - 无需安装
IRC 是首个互联网聊天协议。现在使用较少，但仍可有效地用于