This is a free VST bass plugin that I found online made by yohng and they also offer other free plugins so feel free to check those out.
4Front Bass is a free yet tiny bass plugin that has a perfect touch of a bass guitar. You don’t need to spend a lot of time tweaking those settings like those other plugins out there. It’s a straight-up plugin and play kind of VST.
The best part is it’s available for WIN and MAC and also it’s very light on your CPU.
Here is a little video on how it works.