Mine:
Family Matters-on hiatus, but Nagaina has still shown signs of life.
The Workhorse-hasn't been updated for a while and I'm hoping that Backburner isn't gone.
Zap Apple Jam-a sequel was started, but TheBronyRun hasn't worked on it since the past year. Hoping he's not dead.

Canterlot Courtship

the work horse and the one above (or below depending on if it's old first)

A Canterlot Courtship and Family Matters

A Canterlot Courtship.

Canterlot Courtship
Apple of Twi's Eye (Here's hoping the author tries those last few chapters again)
Sparkling Cider
Old Traditions
I'm Still Me
Childhood Toys (The very first TwiMac I ever read, and the story that got me into the pairing )

2362200 I love Childhood Toys! Such a cute story!
Another favorite include Fragile
Sparkling Cider
Finding a Friend
Zap Apple Jam
A Canterlot Courtship
Prolonging the Magic

Canterlot Courtship
Old Traditions and Sparkling Cider...
I'm Still me...
And several others. I wouldn't have written my own if I hadn't read many more.

2362200
Childhood Toys-I remember her...she vanished off the face of the earth.