Some cleaning
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 * [Summing Bird](https://github.com/twitter/summingbird) - Streaming MapReduce with Scalding and Storm
 * [Algebird](https://github.com/twitter/algebird) - Abstract Algebra for Scala
 * [xerial](https://github.com/xerial/xerial) - Data management utilities for Scala
-* [simmer](https://github.com/avibryant/simmer) - Reduce your data. A unix filter for algebird-powered aggregation.
 * [PredictionIO](https://github.com/apache/incubator-predictionio) - PredictionIO, a machine learning server for software developers and data engineers.
 * [BIDMat](https://github.com/BIDData/BIDMat) - CPU and GPU-accelerated matrix library intended to support large-scale exploratory data analysis.
-* [Wolfe](http://www.wolfe.ml/) Declarative Machine Learning
 * [Flink](http://flink.apache.org/) - Open source platform for distributed stream and batch data processing.
 * [Spark Notebook](http://spark-notebook.io) - Interactive and Reactive Data Science using Scala and Spark.
 

- Simmer: not updated for ages
- Wolfe: link is broken