I'm recommending Martha Jones-centric fics all this week but they're not all Martha/Ten.
I posted this recommendation yesterday but it seems to have disappeared, so I'm making two recommendations today to make up for it.
Story: The Wake
Author Summary: Martha visits The Wheel in the aftermath of the Cybermen.
Characters: Martha Jones, Zoe Herriot
Rating: All Ages
Word count: 940
Recced because: This is a sweet and gentle tale with a vein of humour in which Martha continues to be her usual compassionate self, despite a long lifetime of dealing with aliens:
Martha slept fitfully on the rocket ship. Space travel was not a new sensation to her–she'd been to her first alien planet while still at university and to many more since then–but it had been a much more advanced ship that had first ferried her across the void of stars. Not a human ship–which were still crude and ungainly things more than a century after the Apollo Project–but an alien vessel: a living ship that traveled through time and space at the flick of a switch and the turn of a dial.
Earth's rocket ships, she was given to understand, tended to get where they were going more often.