Curated List of Useful Search Engines, Tools, and Online Resources for Developers

Search Resource Websites

When learning technology, we often need search engines to retrieve information; domestically Baidu is common, but Google is recommended if possible. Alternative options include:

Bing

International version: https://cn.bing.com/ – a reliable alternative.

DuckDuckGo

https://duckduckgo.com/ – does not collect user data and has no ads.

Stack Overflow

https://stackoverflow.com/ – a vast source of technical answers, useful when Google is unavailable.

Gitlogs

https://www.gitlogs.com/ – a search engine specialized for GitHub projects.

Jiumo Search (鸠摩搜书)

https://www.jiumodiary.com/ – helps find technical documents and manuals, many hosted on Baidu Cloud.

Ebooke

https://ebookee.org/ – free e‑book download search engine.

Iconfinder

https://www.iconfinder.com/ – icon search for logos and graphics.

TinEye

https://www.tineye.com – reverse image search by uploading an image or providing its URL.

Semantic Scholar

https://www.semanticscholar.org/ – free academic search engine indexing journals and conference papers.

LibreStock

https://librestock.com/ – high‑quality free stock photos.

CC Search

https://ccsearch.creativecommons.org/ – searches for copyright‑free images.

Pexels

https://www.pexels.com/ – free high‑resolution photos.

Unsplash

https://unsplash.com/ – another source of free high‑quality images.

The App Store

https://theappstore.org/ – search tool for iOS, iPadOS, and macOS applications.

Tool Categories

Image‑Related Tools

TinyPNG: https://tinypng.com/ – free online image compression.

picdiet: https://www.picdiet.com/zh‑cn – JavaScript algorithm compresses images up to 80% without quality loss.

SmartResize: https://www.smartresize.com/zh‑cn – batch image cropping and scaling tool.

Regular‑Expression Tools

https://regexr.com/ – visual regex editor.

https://jex.im/regulex/ – another visual regex explorer.

File Conversion Tools

https://smallpdf.com/cn, https://convertio.co/zh/, https://www.online-convert.com/, https://www.pdftoword.com/, https://tools.pdf24.org/zh/, https://cn.office-converter.com/ – support conversion among PDF, images, Word, and other formats.

Online Compilers

https://rextester.com/, https://www.onlinegdb.com/, https://c.runoob.com/ – run and test code for various languages (PHP, Java, C, etc.) online.

HTML, CSS, JS, Design Tools

JSFiddle: https://jsfiddle.net/

CodePen: https://codepen.io/

Runoob: https://c.runoob.com/front‑end/61

JSON Parser: https://c.runoob.com/front‑end/53

Online PS: http://www.kantu.com/

Table Converter: https://tableconvert.com/ – converts between Markdown, HTML tables, CSV, and Excel.

DesignCap: https://www.designcap.com/ – online poster design with templates.

Mind‑Mapping Tools

Xmind: https://www.xmind.cn/ – cross‑platform mind‑mapping software.

ProcessOn: https://www.processon.com/ – free online diagramming with real‑time collaboration.

MindMaster: https://www.edrawsoft.cn/mindmaster/ – supports Windows, Mac, Linux, and mobile platforms.

MindMeister: https://www.mindmeister.com/zh – online mind‑mapping with millions of users.

Baidu Brain Map: http://naotu.baidu.com/ – simple online mind‑map tool.

Gliffy: https://www.gliffy.com/ – Chrome extension for creating flowcharts, UML, wireframes, BPMN, and org charts.

Document and Note‑Taking Platforms

Evernote: https://www.yinxiang.com/

Youdao Note: https://note.youdao.com/

OneNote: https://www.onenote.com/

Mubu: https://mubu.com/

WizNote: https://www.wiz.cn/

Shimo Docs: https://shimo.im/

Google Keep: https://keep.google.com/

Simplenote: https://simplenote.com/

These platforms enable cloud‑based note‑taking, knowledge organization, and cross‑device synchronization.