HDD GURU FORUMS

I'm looking for the differences between the following tools offered by this very site: Wipe My Disks, HDD Wipe Tool, and HDD LLF Low Level Format Tool. It sounds like they all do the same function. They all erase data securely, no? They all work at the sector leviel. So, what's the fundamental differences between these tools?

Lastly, the does the HDD Wipe Tool work on SSD drives?

Thank you.