The ESV clip gets its content from the net. E-sword has lots of translations too, and pretty much all translations can be found somewhere on the net. The problem is the copyright, and in particular the large sums some copyright holders want to allow their translation to be used in a program - e.g. for the NIV it's a five-figure sum just for an advance, and then a per-copy fee.
One interesting translation that I've only just become aware of is the NET Bible,
http://net.bible.org. In terms of translation principles it's close to the NIV, and it's available for free.