NCache vs Redis: What are the differences?
Developers describe NCache as "Distributed In-Memory Datastore". It is an extremely fast and scalable distributed cache for .NET. It helps high traffic server applications remove data storage bottlenecks by caching application and linearly scale to handle extreme transaction loads without slowing down. On the other hand, Redis is detailed as "An in-memory database that persists on disk". Redis is an open source, BSD licensed, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets.
NCache and Redis belong to "In-Memory Databases" category of the tech stack.
Redis is an open source tool with 37.4K GitHub stars and 14.4K GitHub forks. Here's a link to Redis's open source repository on GitHub.