If you have done an investment into traditional relational data warehouse technology and are now stuck in managing multiple ETL processes, then recommended cause of action is to use Dat-a-MazeHouse as integration components in various bottleneck areas of your system. Start fixing most expensive places in your DW/ETL pipe and achieve full agility in iterations.
It might be so that your need is as modest as to integrate some data sources to perform ad-hoc analysis. You have no intention to build and maintain a data warehouse. In this case we can provide components that help you to do just this. Once or at need bases. Fast and at low cost of ownership.