Some fic, one meta resource:
Resonance3300 words | PG-ish | Tony Stark, Bucky Barnes, Steve Rogers, Pepper Potts, etc.
Tony's reasons for helping Bucky Barnes can be entirely attributable to general do-gooderism and a love of science. (Because he really, really hates it when people rub his personal growth in his face.)
Creation Myth870 words | PG-ish | Steve Rogers (Howling Commandos)
Smoke, mirrors, and the true birth of the Howling Commandos.
True Faith and Allegiance2000 words | PG-ish | Sam Wilson, Steve Rogers, Bucky Barnes, Clint Barton
"Are you ready to follow Captain America into the jaws of death?" means something else in the Twenty-First Century. Bucky Barnes has the same answer. Sam Wilson, former Avenger and current fugitive, appreciates that on many levels, including the ones he's sure he's missing.
Allies1500 words | PG-ish | Bucky Barnes, Peggy Carter (Steve Rogers)
It's less strange bedfellows and more complementary parts: Bucky Barnes and Peggy Carter have more in common than Steve Rogers: they have a war to win. And a war to survive.
Renovation3800 words | PG-ish | Bucky Barnes, Wanda Maximoff, Steve Rogers
In which Wanda uses her powers for good and Bucky starts sorting through his past, both metaphorically and kinda literally.
Sam Wilson, actual badass [meta]The requirements for becoming a USAF pararescueman. Or, why Sam really wasn't kidding when he said that he did everything Steve did, just more slowly.