Not trying to diminish zulucrypt here but I really hope people aren't choosing encryption programs based on the GUI framework they use.
It also doesn't hurt if you hash it into or xor with existing randomness, it will still be as strong as the best source of entropy you have even if it's all 0's being mixed in.
Bitlocker and FireVault are very easy to use compared to VeraCrypt or LUKS, and they are much more common. So many Linux installations don't have disk encryption…