I'm looking for a program where I can make my own custom go problems. Does anyone know of a software that has this function?

I can't be the only one who's wanted to do this

Do you want to make SGFs or images?

For SGFs, you can simply use the KGS applet ("Create SGF" or something).

For images: GoWrite2 is pretty popular (http://www.gowrite.net/GOWrite2.html).

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My "guide" to become stronger in Go

Thanks SoDesuNe, I'll check out GoWrite2, but I'm looking for something where: (a) I can go through my custom tsumego one after another, like flashcards and (b) the software plays set variations against me. I don't think making SGF files or images solves this problem.

EasyGo for iOS does this specially well, as far as desktop software I guess it depends mostly on your operating system. But Uligo should solve most of these things. And definitely you need to create sgf files of the problems with said variations.

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Geek of all trades, master of none: the motto for my blog mostlymaths.net

GoGrinder is the app I use to play out tsumego I create.

I create them in Drago usually.

I've downloaded GoGrinder, and it seems to be what I'm looking for. Thanks for your help, guys!