Add a few more projects

Author: velvia

docs/community-projects.md

@@ -8,6 +8,14 @@ Here is a list of Spark projects contributed by the community.  If you have an i
 # Spark Infrastructure
 
 * [Spark Job Server](https://github.com/spark-jobserver/spark-jobserver): A REST service for submitting, managing, and tracking multiple Spark jobs.
+* [Spindle](https://github.com/adobe-research/spindle): Spark/Parquet-based web analytics query engine
 
 # Spark Data Sources
 
+* [Spark Cassandra Connector](https://github.com/datastax/spark-cassandra-connector): Easily load your Cassandra data into Spark and Spark SQL; from Datastax
+* [Spark ElasticSearch Support](http://www.elasticsearch.org/guide/en/elasticsearch/hadoop/current/spark.html): via the `EsInputFormat`
+
+# Other
+
+* [Thunderain](https://github.com/thunderain-project/thunderain): a framework for combining stream processing with historical data, think Lamba architecture
+