I haven't tried it by myself, but I heard there are some for it. I think maybe all Capture Card Devices will be compatible. (I'm not sure)
yes there is and they work for any system ( like capture cards are supposed to )
Yes
To copy between N64 memory cards, you'll need an N64 memory card adapter or a compatible device like the Nintendo 64 Transfer Pak. First, insert both memory cards into the adapter or the Transfer Pak, then use the appropriate software on your N64 game that supports memory management, such as "Pokémon Stadium." Follow the on-screen prompts to select the data you want to transfer and complete the copying process. Make sure to save any changes before removing the cards.
Pinnacle's Dazzle cards mostly are not supported on Macs. Pinnacle do produce a Mac Video Capture unit (See links below).
Yes Goeman games work on the N64 for American Systems. To make sure you have the correct cartridge, look on the back of games for NAL - this means North American and will work for your N64. However PAL and JPN will not work unless you have that specific game system.
No
Avermedia game capture
Yes the n64 can but to play Japanese games on the system is to get rid of the plastic tabs in the cart slot because that stop Japanese games from going in.
i don't think they do but n64 does
You can Google capture cards and you will be able to find cheaper capture cards.
As long as you have the proper codes for your version of the software you shouldn't have any problems getting it to work.
If you don't want to have to use your computer, there are external capture cards available. Yet they are a little bit more expensive then an internal video capture card.