I like:

BlockChain / Ether Geth Parity / Mining

flight tracking/mobile location-based service (LBS)/car tracking (GM OnStar)

RESTFul/JAXB/J2ee/Javascript/prototype/CSS3/JQuery/Ajax/Json/knockout/bootstrap

MVC/MVVM/Service Locator/Factory/Singleton/VO/DAO

Google Earth (kml)/Bing map/Google map/MapQuest/Leaflet.js

Oracle/Db2/NoSql/MongoDB/Cassandra/hibernate/mybatis/JPA

Junit/easyMock/Sonar/Sahi