We, as Ubuntu users, are living, aren't we, in the "open", enjoying thousands and thousands of free open-source applications, that offer a powerful, qualitative, secure and satisfying computer experience.
Nevertheless, while security, productivity, web-browsing, document-creation, etc wise, the "open" is a no-compromise platform, there are niches that are (were) untouchable by the open-source software.
While a niche is a niche (a small portion of "something"), due to the modern world's tendencies, it seems that various niche pieces are gathering interest.