Just for personal convenience
Search Engine
| Microsoft Academic Search | WolframAlpha | |
| Googto | Web of Knowledge | Scopus |
| ScienceDirect | Academics.IO | Bielefeld Academic Search |
Dev Tools
| AWS Console | DigitalOcean | Online Diff Check |
| 在线工具 开源中国社区 | JSON 在线编辑器 | regex tester and debugger |
| Check Browser Compatibility | Visual Studio Online |
Invitation
| Dropbox | DigitalOcean | WizNote |
| Outlook | GMail |
Less Frequent
Text
| Kindle Notes and Highlights | CmdMarkdown编辑阅读器 | Online LaTeX Equation Editor |
| Smallpdf | HTML to PDF |
Image
| 图片转文字 图片转字符 | TinEye Labs | Online Image Splitter |
| iConvert Icons |