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This page will chronicle various accessory finders for 35mm, medium-format, and digital cameras. I will add more as I encounter them.
Cosina plastic viewfinders (15mm, 21mm, 21/25mm, 25mm, 28mm, 35mm, 40mm). These pop up under a number of names: Cosina, Voigtlander, Ricoh (GV-1), Epson (RD-1 finders), possibly also Konica. They all feature a plastic unibody (body and foot) and coated optics. Some focal lengths have framelines, others do not. These were a good value for the money at $99, but for what some of these command today, you might look elsewhere.
Epson RD-1 finders. See Cosina plastic finders above. These are very specific to the fields of view created by putting typical 35mm focal lengths in front of a DX sensor.
Kobalux 21mm and 28mm metal viewfinders. These two viewfinders came in black anodized and silver pearl chrome finishes. They accompanied the 21mm and 28mm Kobalux lenses (discontinued 2002).
Kodak Retina 50/90mm Sport Finder. A bit smaller than the Leica equivalent (ROSOL), the Kodak finder is a nicely made flip-up frame finder that covers 50mm and 90mm focal lengths. The one thing that is not very convenient about this finder is that to see the 50mm frame, you need to flip the 90mm mask and 90mm eyepiece restrictor out of the way. But for what it sells for, it's a solid piece of work.
Konica M-Hexanon Dual 21-35mm finder. This resembles the Cosina plastic finders (see above), but it's larger and a bit less distorted. Has 21mm and 35mm frames, parallax corrected.
Leica 21mm plastic brightline finder (1200x series). Some have locks, some don't. Most have brightlines. This is really no different from the metal 21mm finder (SBKOO) that Leica has been making since the 1950s.
Leica Universal Wideangle Finder M. See separate article.
Mamiya 7 50mm viewfinder. This is the correct viewfinder for a 50mm lens on 6x7 (or 6x9 cropped to an 8x10 print) or a 65mm lens on a 4x5 camera. Includes a handy bubble level visible in the viewfinder, a crosshair denoting the center of the frame, parallax correction corners, and framing marks for the Mamiya 7, and integral diopter correction(!).
Mamiya Super 23 Wideangle Finder (65mm). One thing that cannot be ignored is that there is a direct relationship between the size of an accessory viewfinder and how low its distortion is. The Mamiya has this covered; it is a very big finder with very low distortion. As an added bonus, it also has a cold shoe on its top. This finder is relatively easy to disassemble to insert a Wratten 90 viewing filter.
Mamiya Super 23 Wideangle finder (50mm). Like the 65mm counterpart, it is amazingly easy to underestimate the size of this finder, which has a rectangular base with a cylindrical optical unit on top. The reason it is easy to underestimate the size is that in pictures, it is usually mounted on the top of a Mamiya Super 23 press camera or a Fuji G690, either of which is about double the size of a 35mm rangefinder camera.
Ricoh GV-1. See Cosina plastic finders above. The GV-1 differs primarily in that it shows dual 21mm/28mm frame equivalents and is offset to accommodate the popup flash on the GR Digital series.
Tewe 35-180mm Zoom Finder. This finder, copied both by Nikon and Canon for their rangefinder cameras, uses a combination of changed magnification and apparent frame size to cover the range from 35mm to over 180mm. There is a parallax corrector on the mounting shoe. Like all parallax correctors, you will forget to use it.
Voigtlander Kontur. This is Voigtlander before the bodysnatcher Cosina got to it. This is an ingenious (and very small) finder that is available in 2x3 and 6x6 formats (always normal lenses). It uses a high-powered positive lens to focus your nondominant eye on a brightline mask. Keep both eyes open, and you can see the frames projected onto your subject.
Voigtlander Turnit (Original 35/100mm). The same person at Voigtlander who figured out that you could use an optical illustion to project framelines into a user's stereo vision also realized that the magnification of a 35mm finder is roughly the reciprocal of a 100mm finder. The result is the Turnit, which can be rotated 180 degrees to be either a passable 35mm finder or a decent 100mm finder.