QGroundControl v5.1 Release Candidate 2 is available! 
The second release candidate for QGroundControl v5.1 is now available for testing on all platforms.
Download: Download and Install | QGC Guide
What’s New
See the What’s New page for a summary of user-facing changes since V5.0.
Of special note: the HUD pitch display direction has been corrected in V5.1 — pitching nose-down now moves the pitch indicator down, matching the roll convention. See the HUD documentation for details.
If you want to know exactly what changed between RC1 and RC2, the GitHub release notes include the full list of pull requests merged since RC1.
Help Us Test
This is a release candidate — the more people who try it before the final release, the better. Please report any problems you find on GitHub Issues, noting that you are running v5.1 RC2.
Thanks for testing!