There are actually a bunch of Ruby frameworks (ramaze, rango, waves, padrino, camping, halcyon, to name a few off the top of my head), but it seems Rails and Si

There are actually a bunch of Ruby frameworks (ramaze, rango, waves, padrino, camping, halcyon, to name a few off the top of my head), but it seems Rails and Sinatra meet the needs for the vast majority of Ruby web developers.