Tools

Geophysics

• IRIS Message Center
• IRIS Seismic Monitor
• IRIS Station Monitor
• 3-D earthquake display
• IASPEI standard phase list
• Free oscillations of the Earth

Chemistry

• Periodic Table
• Interactive periodic table of the elements

Document Processing

• Squoosh: Image compression web app provided by Googl
• PDF2JPG: Free PDF to JPG converter
• Smallpdf: Solve any problems with PDF (conversion, compression, rotate, merge, unlock)
• ILovePDF: Every tool you need to work with PDFs
• ILoveIMG: Every tool you need to work with images
• Convertio: Converts for fonts, video, audio, presentation, image, ebook et al
• Merge pdf in linux
• cpdf: Trans-platform PDF process tookit
• PDFtk: Trans-platform PDF process tookit
• ImageMagick convert
• Logoly: A Simple Online Logo Generator
• WebPlotDigitizer: Web based tool to extract data from plots, images, and maps

Web

• IPIP: The best IP database

Programming

• regex101: Online regular expressions tester and debugger
• DevDocs: API documentations of multiple programming languages/tools in one place
• Choose an open source license: Simple way to choose a license

ESL (English as a Second Language)

• Grammarly: Free writing assistant to check your grammar

Life

• 万年日历查询

Revision history

• 2019-12-25: update some links, commit to seisman
• 2019/11/07: initial draft, reference to Seisman’s links