Personally, modules have been the thing I wanted most in redis for years, and it's been a delightful experience working on modules for the past months. I really think it's a game changer for redis and I can't wait to see where this will take it in the coming years.<p>Some modules that are already out there (full disclosure - I work at Redis Labs and I've developed a couple of those):<p>* redis-cell - a rate limiter module <a href="https://github.com/brandur/redis-cell" rel="nofollow">https://github.com/brandur/redis-cell</a><p>* Redis Graph - a graph DB with a subset of Cipher for querying. <a href="https://github.com/swilly22/redis-module-graph" rel="nofollow">https://github.com/swilly22/redis-module-graph</a><p>* RediSeach - fast full-text search engine with fuzzy auto-suggest. <a href="https://github.com/RedisLabsModules/RediSearch" rel="nofollow">https://github.com/RedisLabsModules/RediSearch</a><p>* redis-ml: Machine learning models as redis data types. <a href="https://github.com/RedisLabsModules/redis-ml" rel="nofollow">https://github.com/RedisLabsModules/redis-ml</a><p>* redablooms - scalable bloom filters <a href="https://github.com/RedisLabsModules/redablooms" rel="nofollow">https://github.com/RedisLabsModules/redablooms</a><p>* Secondary indexes with a small subset of SQL for WHERE clauses. <a href="https://github.com/RedisLabsModules/secondary" rel="nofollow">https://github.com/RedisLabsModules/secondary</a><p>* Time Series <a href="https://github.com/saginoam/RedisModuleTimeSeries" rel="nofollow">https://github.com/saginoam/RedisModuleTimeSeries</a><p>PS If you're interested in creating modules, we've started a community for module developers. <a href="https://groups.google.com/forum/#!forum/redis-module-devs" rel="nofollow">https://groups.google.com/forum/#!forum/redis-module-devs</a>