html、js、css
http://jsfiddle.net/
http://runjs.cn/code

C，C++，D，Haskell，Lua，OCaml，PHP，Perl，Plain Text，Python，Ruby，Scheme，Tcl等
https://eval.in/
http://codepad.org/
http://tool.lu/coderunner
http://cogug.com/
https://coderpad.io/
http://cyber-dojo.org/setup/show/
http://www.tutorialspoint.com/codingground.htm
http://codevs.cn/

Scala
http://zh.scala-tour.com/#/hello-wolrd

在线IDE
https://koding.com/

API测试
https://apigee.com/console/
http://www.bejson.com/go.html?u=http://www.bejson.com/httppost/

httpbin(1): HTTP Request & Response Service
http://httpbin.org/
http://ifconfig.me/

sql
http://sqlfiddle.com/

正则
https://regex101.com/
http://www.regexr.com/
https://regex101.com/
正则表达式图形分析

远程唤醒
http://www.depicus.com/wake-on-lan/woli.aspx

html、xml、css、json、javaScript、java、sql格式化
http://tool.oschina.net/codeformat/json
http://tool.oschina.net/
http://www.kjson.com/
http://www.useol.com/

ping、TraceRoute、dns
http://alibench.com/
http://ping.pe/
http://www.ipip.net/ping.php
http://www.17ce.com/
http://ce.cloud.360.cn/
http://ping.chinaz.com/

Base64
http://www.kjson.com/encrypt/base64/
http://tool.chinaz.com/Tools/Base64.aspx
http://tool.oschina.net/

浏览器指纹
https://panopticlick.eff.org/
http://www.ip-score.com/
https://ipleak.net/
http://whoer.net/extended
https://www.browserleaks.com/canvas

BGP
http://bgp.he.net/AS4134

在线pdf阅读
http://www.useol.com/pdfReader/

在线Crontab表达式执行时间验证
http://www.atool.org/crontab.php

在线 htpasswd 生成器工具
http://www.atool.org/htpasswd.php

在线端口扫描
http://www.atool.org/port_scanner.php

在线抓包
http://www.atool.org/port_scanner.php