Technology Categorization
Search Engines
Elasticsearch
Solr
Search Engine Articles
https://logz.io/blog/solr-vs-elasticsearch/
https://db-engines.com/en/system/Elasticsearch%3BRedis
https://towardsdatascience.com/an-overview-on-elasticsearch-and-its-usage-e26df1d1d24a
Databases
SQL Databases (Relational)
MySQL
PostgreSQL
NoSQL Databases
Document (Storage Model)
MongoDB
CouchDB
Key-value (Storage Model)
DynamoDB
Redis
Wide-column (Storage Model)
Cassandra
HBase
Graph (Storage Model)
Neo4j
Amazon Neptune
Database Articles
https://www.mongodb.com/nosql-explained/nosql-vs-sql
https://db-engines.com/en/system/Elasticsearch%3BRedis
To Classify
ActiveMQ
Databricks
Hadoop
Coherence