Note that the data is biased towards Apache projects due to the meetup being organized at ApacheCon US 2009.
The following open source projects were mentioned. The list is in alphabetical order, as the data set is too small to make any reasonable ordering by popularity.
- Tokyo Cabinet
Many responses were about the "big data" aspect of the NoSQL movement. Some frequent keywords: distributed storage, large transactional data, consistency, failover, availability, reliability, stability, failure detection, failed node replacement, (petabyte) scalability, consistency levels, storage technology, performance, benchmarks, optimization, backup and recovery, map/reduce
Another common theme were the various database types and the NoSQL "development model". Keywods: document stores, key/value stores, consistent hashing, graph databases, object databases, persistent queues, content modeling, migration from the relational model, social graphs, streaming, software as a service, offline applications, full text search, natural language processing
Beyond the above big themes, I found it interesting that the following technologies were specifically named: Erlang, Java, WebSimpleDB, WebDAV
In addition to specific topics, many people were asking for case studies or "lessons learned" -type presentations.