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nvi (new vi) is a re-implementation of vi. nvi was written by Keith Bostic and currently seems to be frozen at version 1.79. It is the default vi on all BSD systems (NetBSD, OpenBSD, and FreeBSD) as well as MINIX. BSD projects continue to use nvi version 1.79 due to licensing differences between Berkeley Database 1.85 and the later versions by Sleepycat Software. nvi is unusual because it uses a database to store the text as it is being edited. nvi is only available on POSIX/Unix platforms due to its reliance on the curses/ncurses library.