Well, to make it easier to differentiate Unstable and Stable builds of feren OS, you will notice that from 2017.0 onwards, there will be some differences to it's Stable brother...
1. Grey Logo
For Alpha, BETA and RC builds, the logo will be unsaturated (aka: grey-scale), so it'll look a bit like this in other words:
(Also Related: Which Logo would you like in 2017.0?)
2. Different Default Wallpaper
This one's already been in affect since 2016.1, but anyways, for the default wallpaper, in development builds, it'll be different (most likely a picture of a building since buildings are constructed) to it's Stable version, for example, 2017.0 Development Versus 2017.0 Stable:
Changes to download pages for Unstable Builds:
The page to upload ISOs for Unstable Builds has been moved to SorceForge due to the problems with MEGA for people in the past, you can now find them on the Developer Center and here:
It's great making something for the community that might become quite big and remain for a very long time to continue serving the community and helping Linux as a result.