If you can't explain it simply, you don't understand it well enough
- Programming language: PHP, javascript
- CMS & Framework: Laravel, Wordpress, Joomla, CodeIgniter, Symfony, Drupal
- Webserver: Apache, Nginx, Nodejs, EC2, S3 manazon
- Database engine: mysql, MongoDB, Cassandra
- Search engine: Lucene, Solr
- Cache engine: Memcache, Redis
- Scriptable browser: Phantomjs, Casperjs, Slimerjs, Seleniun
- Log & test: Unit test, Bloom filter, Hadoop, Stomp, Jmeter, Graylog2
- More: Mobile app, Browser extension, SHELL, crawler, autobot