IBM suite holds all the software development tools from source code to testing, requirements, and data warehouse reports and BI Since it's all combined and managed, you can have enterprise components of the above list, and they work bi-directionally with each other - so you can force attaching a task to a code that is related to the same user, and it is on the current sprint, the data warehouse capabilities are endless like the live Excel export that you can work on the sheet data offline and get updates when you're connected. Review collected by and hosted on G2.com.
The biggest drawback is that IBMers do not use it as their primary source control. So by not promoting it, the popularity declined dramatically, and developers moved to open source code versioning and cloud options where their code resides outside the vendor's premise (e.g., China). So the gist is IBM doesn't promote its product, and so the popularity declines. The source control plugin supports only Eclipse and Visual Studio clients, making it hard for other IDEs to blend in. Review collected by and hosted on G2.com.