Openware tools provide freely available and customizable software alternatives for data analysis. Some popular openware tools include Apache Spark, KNIME, RapidMiner, Hadoop, Pentaho, Grafana, Bipp, Cassandra, and Tableau. These tools offer benefits like low or no cost, transparency, flexibility to customize, strong community support, and ability to access source code. Companies and users choose openware tools for data analysis to gain business insights affordably while protecting data security and privacy.