When the resource you're accessing is a network service, the support code tends to be called "clients" rather than "libraries".
The main Redis site has this page for listing the known clients:
https://redis.io/clientsIt has sub-pages that categorize by language, with the C++ clients on this page:
https://redis.io/clients#c--The best one will depend on your needs. For example, if you want thread safety, or support for Redis Cluster, connection pools, and so on.