RocksDB An embeddable persistent key-value store for fast storage. RocksDB can also be the foundation for a client-server database but our current focus is on embedded workloads.
RethinkDB RethinkDB is built to store JSON documents, and scale to multiple machines with very little effort. It has a pleasant query language that supports really useful queries like table joins and group by, and is easy to setup and learn.
InfluxDB An open-source distributed time series database with no external dependencies. InfluxDB is the new home for all of your metrics, events, and analytics.
CollagePlus This plugin for jQuery will arrange your images to fit exactly within a container. You can define the padding between images, give the images css borders and define a target row height.