The N5 is slot 1 flashcart which is a near exact clone of the R4 card. It does exactly the same as an R4 and it's Kernel looks similar to an R4 kernel with the exception of the logo change meaning it has the same compatability of an R4. The N5 team's website
http://dsn5.com/ The site appears to be dead as it now gives a 404 error (as it is written on the flashcart itself) look similar to the R4 team's website. The flashcart itself seems to have been made from a similar mould and has the N5 logo on the front with the website adress on it. However the N5 had a big problem (which is now fixed) where micro sd contacts would touch the circuit board on the N5 and short out the Nintendo ds and possibly blow the system's F2 fuse renderding the system unusable. However unlike the R4 team, kernel updates are still being made for the N5.