Stack Overflow posts are CC-licensed and all the data is available at https://archive.org/details/stackexchange https://archive.org/details/stackexchange - this

Stack Overflow posts are CC-licensed and all the data is available at https://archive.org/details/stackexchange https://archive.org/details/stackexchange - this is where Zest downloads it from. Dash also provides SO search, though only in titles (no full text search).