We had some discussions about this on the old forums in summer 2015, when it became clear Memrise was heading downhill, but we can’t continue that discussion since they deleted the old forums, and it’s possible some things have changed since then.
Here’s one such discussion:
Back then, the two main suggestions were anki and cerego.
I tried cerego, but it’s not even close to being a replacement for memrise. It lacks most of the basic features. You can’t have synonyms columns, you can’t have multiple images or multiple audio samples for the same item, there are no mems, etc. Cerego is completely inadequate.
Anki, I looked at and rejected partly because there were no forums to discuss things with other people taking the same course. How funny! However, it also didn’t have mems, had very few courses, and defaulted to multiple choice for everything, with a lot of annoying effort to do typing courses. It seemed seriously inferior to memrise. Of course, as memrise gets worse and worse, maybe we’ll be down to anki-level soon anyway.
I’ve stuck mostly with memrise because, despite going downhill for two years now, it’s still better than any alternative I’ve found. But recent changes (bugs they don’t take seriously and don’t seem to care about fixing) have made it impossible to use memrise.
I can no longer improve and maintain my courses because of this database bug: Cannot add items from database to levels
I can no longer take half the courses I’ve been taking, because of the commas bug: Has there been a change in the way memrise treats commas?
So it’s time to look again. Cerego hasn’t gotten any better (I know because I did start two courses there and have continued with them). Has Anki? Or is there anything else similar out there now?