A few caching technologies

1. Memcached
2. Redis
3. Nache
4. Ehcache
5. ElastiCache

Memcached - In-memory key/ value store, open source

Redis 

• Adds more features
• Snapshots, replication, transactions, pub/sub 
• Advanced data structures
• More complex in general

Ncache

• Made for .NET, Java, Node.js

Ehcache

• Java
• Just a distributed map really

ElastiCache

• Amazon Web Services (AWS) solution
• Fully-managed Redis of memcached