Redwall MUCK operates using the Telnet protocol.
While most machines come with native telnet support, below is a list of free, recommended MU clients.
These clients have features that make it easy to use the MUCK and customize your experience: input and output boxes, game logs, scripting, highlights, etc.
This is by no means a complete list of available clients.
Each has its own setup but the general idea is to put
redwall.realm.limitless.org in the host field and
4203 as the port.
Terminal / CLI
No download required for these web-based clients.
MUCK Clients (2011) is a more in-depth article and contains a handful of clients not listed above. Bear in mind that it was authored a decade ago, so some clients may no longer be supported or stable.