Loopzazoid by NextSoft is my favourite Drum Sampler VST,
It’s not out of the box because you need to create your own kits.
If like me you’ve got shed loads of drum samples it’s really easy to set up a kit.
Your samples though will probably need converting as Loopazoid only accepts samples at 16bit.
It’s free, it works and it’s totally customizable.
VST2 virtual drum sampler with 48 channels, 64 voices (stereo or mono), 4 stereo outputs. Compatible with 8/16 Bit WAV/AIFF samples.
Supported platforms: VST2 plugin for MacOS / Windows
Download for free here.
There are also some free resources regarding the Loopazoid(click)
And you never know, I might just create a kit and tutorial to fit in here.