1. Neo4j：
它是最著名的图形数据库管理系统，也是由Neo4j，Inc.开发的NoSQLdatabase系统。它与Mysql或MongoDB不同，因为它具有使其功能与其他数据库管理系统相比特别的特点。 Neo4j还以图形形式存储和显示数据，而不是以表格格式或Jason格式。在这种情况下，整个数据由节点表示，您可以在节点之间创建关系，这意味着整个数据库集合将看起来像一个图形，这使得Neo4j在其他数据库管理系统中独树一帜。
2.卡桑德拉：
它是一种分布式数据库管理系统，该系统是开源的，具有宽列存储，NoSQL数据库，该数据库旨在处理和支持许多服务器上的大量数据。它为我们提供了高可用性，没有单点故障。它最初于2008年7月发布，由Apache Software Foundation开发。
Neo4j和Cassandra之间的区别：
| S.No. | Neo4j | Cassandra |
|---|---|---|
| 1. | It was developed by Neo4j, Inc. | It was developed by Apache Software Foundation. |
| 2. | It was initially released in 2007. | It was initially released on July 2008. |
| 3. | It is written using Java and Scala language. | It iswritten only in Java language. |
| 4. | Neo4j server operating systems are Linux, OS X, Solaris, and Windows. | Its server operating systems are BSD, Linux, OS X, Windows. |
| 5. | It has foreign keys. | It does not have foreign keys. |
| 6. | Neo4j APIs and other access methods includes Bolt protocol, Cypher query language, Java API, Neo4j-OGM, RESTful HTTP, API, Spring Data Neo4j, TinkerPop 3. | APIs and other access methods include Proprietary protocol and Thrift. |
| 7. | It is data schema free and schema optional. | It is data schema free. |
| 8. | It does not support SQL. | It provides support to SQL-like SELECT, DML and DDL statements (CQL). |
| 9. | Its primary database model is is Graph DBMS. | Its primary database model is Wide column store. |
| 10. | Neo4j supports programming languages which are .Net, Clojure, Elixir, Go, Groovy, Haskell, Java, JavaScript, Perl, PHP, Python, Ruby and Scala. | It supports C#, C++, Clojure, Erlang, Go, Haskell, Java, JavaScript, Perl, PHP, Python, Ruby and Scala. |
| 11. | It does not supports Partitioning methods. | It supports Sharding Partitioning methods. |
| 12. | Neo4j is uesd by famous companies like medium.com., Stack, Fiverr, Fundamentei, Trendyol Group, double slash, ingsmen Software, GAPO, etc. | Famous companies like Instagram, Reddit, The Weather Channel, GitHub, etc uses Cassandra. |