Ask HN: What web frameworks/technologies did not succeed as per your expectation

We come across some web frameworks and technologies that we think will succeed, but they wither away as time passes by and don't succeed to the level we expected.

Which web frameworks and or technologies did you come across that you thought would succeed but did not as per your expectations?

For example, I thought that Opa Lang[0] and UrWeb[1] would succeed but did not, even though the ideas were sound.

[0] http://opalang.org

[1] http://www.impredicative.com/ur