1. Camcorder
2. Hopper
3. Hipstamatic
4. Poshmark
6. GIF Keyboard
7. Seashine
9. Burner
11. Bumble
13. Uncrate
15. Pacemaker
16. Hotel Tonight
17. SeatGeek
18. Keezy Drummer
19. Slow Fast Slow
20. Horizon Camera
21. Handle: To-do List, Inbox, and Calendar Manager
22. Tumblr
23. Acorns
24. Curious
UPDATE
This list was updated to remove Afterlight, which is in fact not free and added Curious, which is free.