The easiest for most people is LastPass.
Padlock is worth a look too.
I’m currently rocking the ZTE Axon 7 as my daily driver.
Great screen, excellent hardware (with expandable storage!), decent camera, and okay software. Really impressive for the price.
Mares Avanti Quattros are the best flexible blade fins.
ScubaPro Jet Fins are the best hard rubber fins.
The best price to performance belongs to the DGX Classic Fins.
I also know some experienced divers that swear by Force Fins, so they may be worth a look as well.
There is no such thing as the best split fins.
The 1000 Lumen Dive Light from Dive Right in Scuba has impressive light output, solid build quality, and a great burn time for $75.
You can also use two different battery types: C or 18650 with an included spacer.
I really like the offerings from RTIC.