hi ross,
need a bit more about your background, to shorten the answer.
agile work styles came from software developers, actual common is for example Scrum.
developer need to communicate via work orders (stories, tasks) and need to control their work (files.in a source code control system like a easy version control repository or a software configuration system for more process and variant control)
One common tool from IBM is RTC rational team concert on the Jazz platform, with out of the box processes for agile/scrum.
Developer can connect via Browser, eclipse client, some integration's (visual studio) and with a DevOps solution like Urbancode deploy the code or build on target systems also on mainframe.
https://jazz.net/products/rational-team-concert/
ciao
robert