For example, Japan Camera Hunter tried out Donau ISO 6 (six!) film (which turned out to have a heavy blue cast and was hard to shoot handheld), and Rotwild experimental film which seemed to be a red-scale film. The Donau was difficult to use and had little latitude, while the Rotwild evoked these comments:
"It gives lovely rich reds and orange tones to your images which can be
a lot of fun to experiment with. I had a blast playing with this stuff
and took my time shooting it." -- JCH
Neither of these films were available at time of writing.
in July last year, amyjasek of 52 Rolls gave a package of Kono! Kolorkit with 125T, 250 and 400 films a trial for one week. Note that the 200 is not available as of writing. There are plenty of scanned shots to browse through to get a feel for these films. The 125T is an indoors (tunsten) film, but adjusting the colour in postprocessing seemed to give realistic colours without difficulty.
Kono! The Reanimated Film has more shots on Instagram. A number of different films are featured there.
As of writing, Kolorkit 125T, Kolorkit 400T colour films, Rekorder B&W film and Luft & Liebe films are available. Rekorder is a ISO 100 to 200 film, while Luft & Liebe is a colour negative film with hearts pre-exposed onto the film. A fun film for being playful with friends.
Find Kono! film at the retailers listed here.