Newts 
Newts is a time-series data store based on Apache Cassandra.
- High throughput
Newts is built upon Apache Cassandra, a write-optimized, fully distributed partioned row store.
- Grouped access
It's common to collect, store, and retrieve metrics together, (think bytes in and bytes out, or 1, 5, and 15 minute load averages.); Newts allows for similar metrics to be grouped together, for more efficient storage and retrieval.
- Late aggregation
Most time-series solutions perform in-line aggregations for purposes of later ploting visualizations, even though the ratio of reads to write is staggeringly small. Newts performs plot aggregations at the time of the read.
- Searchable Metadata
Fully searchable sample resource metadata.
More information can be found in the project Wiki, or the homepage.