Gosign has an alternative to blocks, offering them individually. This makes it harder to manage them all but improves discoverability.
I tested the Masonry Post Block & the Posts Slider Block:
This blocks is simple enough with some visual options (gutter spacing, number of lines, list style…) but it lacks the basic feature of letting you choose alternative Post Types, as it only works with Posts.
This is what it looks like in action:
Again, no option to select alternative post types, but I will say this Slider is the one with the most options I have seen so far, even specific responsive view settings. Another not so great point is that the Slider block comes with no categories pre-selected, which may be confusing to users, as they will see no content in their block.
This is what the Slider Block looks in action: