1. Online drawing tool
• Online drawing tool ProcessOn: https://www.processon.com/
• Online drawing tool draw.io: https://app.diagrams.net/
• Online mind mapping tool: http://www.mindline.cn/webapp
• PlantUML online editor: http://haha98k.com/
2. Online coding tool
• BASE64 codec tool: https://base64.supfree.net/
• MD5 encoding tool: https://www.zxgj.cn/g/md5
• AES/DES encryption and decryption: http://www.fly63.com/tool/cipher/
• JWT decoding tool: http://jwt.calebb.net/
• ASCII codec tool: https://www.matools.com/code-convert-ascii
• Unicode codec tool: https://www.zxgj.cn/g/unicode
• UTF-8 codec tool: https://www.zxgj.cn/g/utf8
• String encoding and decoding tools: https://www.zxgj.cn/g/enstring
• URL codec tool: http://tool.chinaz.com/tools/urlencode.aspx?jdfwkey=lbixz1
3. Online conversion tool:
• Online ASCII code comparison table: http://www.fly63.com/tool/ascii/
• Universal conversion tool: https://www.zxgj.cn/g/jinzhi
• Online floating-point decimal conversion: http://www.binaryconvert.com/
• RGB color conversion: https://www.zxgj.cn/g/yansezhi
• Timestamp conversion tool: https://www.zxgj.cn/g/unix
• Unit of measurement conversion tool: http://www.fly63.com/tool/unitable/
• Online JSON analysis: http://www.json.cn/
• Online JS code formatting tool: https://prettier.io/playground/
• SQL compression/formatting tool: https://www.zxgj.cn/g/sqlformat
• JSON and XML online conversion: https://www.zxgj.cn/g/jsonxml
• JSON/YAML online conversion: http://www.fly63.com/tool/jsonyaml/
• RMB case conversion tool: http://www.fly63.com/tool/renmingbi/
4. Regular expression tools:
• Regular expression debugging tool: https://regexr.com/
• Regular expression visualizer: https://jex.im/regulex/
5. Network tools:
• IP address attribution query: https://www.ip138.com/
• IP address query: https://www.ipip.net/ip.html
• HTTP online interface testing tool: http://www.fly63.com/php/http/
6. Visualization/formatting tools
• Online front-end editor: https://codepen.io/
• Online data visualization: https://flourish.studio/
• Online JSON analysis: http://www.json.cn/
• Online CSS code visualization tool: https://enjoycss.com/
• XML formatting tool: https://www.zxgj.cn/g/xmlformat
• Online JS code formatting tool: https://prettier.io/playground/
• SQL compression/formatting tool: https://www.zxgj.cn/g/sqlformat
• JSON and XML online conversion: https://www.zxgj.cn/g/jsonxml
• JSON/YAML online conversion: http://www.fly63.com/tool/jsonyaml/
7. Other common tools:
• Online Nginx configuration tool: https://nginxconfig.io/
• Online comparison tool: http://www.fly63.com/tool/textdiff/
• Online Chrome browser plugin: https://www.crx4chrome.com/
• Online interface document management tool: http://www.docway.net/
8. Online material tools:
• Free transparent background image material: http://pngimg.com/
• Emoji search: https://emoji.svend.cc/
• Emoji expression package download: https://emojiisland.com/
• open source icons：https://feathericons.com/
• Emoji package online website: https://fabiaoqing.com/
• Free PNG image library: https://pluspng.com/
• ICON icon online download: https://www.iconfinder.com/
• Minimalist wallpaper: https://bz.zzzmh.cn/
• Wallpaper Abyss: https://wall.alphacoders.com
• Pixabay image library: https://pixabay.com/zh/
• Unsplash image library: https://unsplash.com
• Pexels image library: http://www.pexels.com
• NASA image and video library: https://images.nasa.gov
9. Design and production tools:
• Online PS: https://www.uupoop.com/
• Online audio clips: https://www.weixinsyt.com/
• Online video clips: https://www.kapwing.com/
• Free online logo making: http://www.uugai.com/
• Online generation of artistic fonts: https://www.qt86.com/
• Online table conversion tool: https://tableconvert.com/
• Online poster design tool: https://www.designcap.com/
• Image intelligent zoom tool: https://bigjpg.com/
• QR code beautifier: https://mh.cli.im/
• Online code screenshot tool: https://carbon.now.sh/
• Online cutout tool: https://www.remove.bg/zh
• Online generation of ICO icons: http://www.fly63.com/php/ico/
• SVG to PNG tool: http://www.fly63.com/tool/svg2img/
• Video to GIF tool: http://www.fly63.com/tool/giftxt/
• QR code online generator: http://www.fly63.com/tool/ewm/
• QR code online decoding: http://www.fly63.com/php/decoder/
10. Writing aids:
• Online word count: https://www.eteste.com/
• mdnice markdown typesetting tool: https://mdnice.com/
• md2all markdown typesetting tool: http://md.aclickall.com/
• Online picture bed artifact: https://picx.xpoet.cn/
• Online free picture bed: https://sm.ms/
• Map bed: https://imgkr.com/
• Online code screenshot tool: https://carbon.now.sh/
• Online short link tool: https://urlify.cn/
• Online text replacement: http://www.fly63.com/tool/textreplace/
11. Online office tools:
• PDF online processing tool 1: https://smallpdf.com/cn/pdf-tools
• Online pdf processing tool 2: https://tools.pdf24.org/zh/
• PDF to word online tool: https://www.pdftoword.com/
• Collection of online multimedia converters: https://cn.office-converter.com/
• Online character recognition tool: https://ocr.wdku.net/
• Online file compression tool: https://docsmall.com/
12. Document note tool:
• Evernote: https://www.yinxiang.com/
• Youdao Notes: https://note.youdao.com/
• OneNote：https://www.onenote.com/
• Curtain: https://mubu.com/
• Wiz notes: https://www.wiz.cn/
• Shimo documentation: https://shimo.im/
• Simplenote：https://simplenote.com/
• Yuque: https://www.yuque.com/
13. Online tutorial documents:
• Git Chinese tutorial: https://git-scm.com/book/zh/v2
• SVN Chinese Manual: http://svnbook.red-bean.com/nightly/zh/index.html
• jQuery API Chinese documentation: https://jquery.cuishifeng.cn/
• Nginx Chinese documentation: https://www.nginx.cn/doc/index.html
• Kafka Chinese documentation: https://kafka.apachecn.org/
• Mybatis Chinese documentation: https://mybatis.org/mybatis-3/zh/index.html
• WeChat Mini Program Official Documentation: https://developers.weixin.qq.com/miniprogram/dev/framework/
• Nodejs Chinese tutorial documentation: http://nodejs.cn/learn
• Apache Web Server documentation: http://httpd.apache.org/docs/
• Chinese version of Spring Documentation: https://www.springcloud.cc/spring-reference.html
• Chinese version of Golang standard library documentation: https://studygolang.com/pkgdoc
• Java 8 official documentation: https://docs.oracle.com/javase/8/docs/api/index.html
• Maven official documentation: http://maven.apache.org/guides/
• Tomcat 8 official documentation: http://tomcat.apache.org/tomcat-8.0-doc/index.html
• Spring Boot official documentation: https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/
• RabbitMQ official documentation: https://www.rabbitmq.com/documentation.html
• RocketMQ official documentation: http://rocketmq.apache.org/docs/quick-start/
• Dubbo Chinese documentation: https://dubbo.apache.org/zh/docs/
• Netty official documentation: https://netty.io/wiki/index.html
• Elasticsearch official documentation: https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html
• Spring Cloud official documentation: https://spring.io/projects/spring-cloud
• Docker official documentation: https://docs.docker.com/get-started/
• Chinese documentation of kubernetes: https://kubernetes.io/zh/docs/home/
• Thymeleaf official documentation: https://www.thymeleaf.org/documentation.html
• Vue.js Chinese documentation: https://cn.vuejs.org/v2/guide/
• React.js official documentation: https://reactjs.org/docs/getting-started.html
• Jenkins Chinese documentation: https://www.jenkins.io/zh/doc/