As well as the relatively new MakeCode from Microsoft[1], multiple projects based on Google's Blockly[2] and obviously everyones goto: Code.org

With the above, and with Scratch 3.0 finally ditching Flash, I think the absolute-beginner-basic-concepts niche is covered. BlockLike is an attempt to imagine what the next step in a progression could be.

[1] https://www.microsoft.com/en-us/makecode

[2] https://developers.google.com/blockly

There's also GP Blocks, which is a better Scratch written in itself:

https://gpblocks.org/

For more background information about GP Blocks from the team that brought Smalltalk, Squeak, Etoys, Scratch 2.0 and Snap! read the following paper:

http://www.vpri.org/pdf/tr2015003_modsys.pdf

It's not obvious to me - why do you think snap is better than scratch?