Programming langauge:

• HTML & CSS & JavaScript
• PHP
• Java SE & Java EE (lovely)
• Go
• Swift
• Python
• Nodejs

Database:

• Mysql
• Sqlite
• Elasticsearch (lovely)
• Redis
• Neo4j

Operation system:

• Centos (lovely)
• Debian
• Arch
• Mac osx (using for develop at home)
• Windows (hated)

Web server:

• Nginx
• Apache
• Tomcat
• Wildfly

Programming on:

• Web backend
• Web frontend
• Android
• IOS
• Desktop (Java swing & Javafx)