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Yes, I think that they should be on-topic.

However, resource requests should be precise to avoid convoluted answers. So questions could be "What good free English-language dictionaries are there?", "Where can I find good grammar references for Spanish?", "What free websites are there to learn Chinese?" or "Are there translators for translating Swedish to Afrikaans?".

Language-learning is a really big topic and there are so many websites, translators, references and dictionaries available that putting everything in one question / answer for one language might lead to users who suddenly are perplexed as to where to start.

A community wiki might be indeed useful for this case as provided answers might change frequently. It might also be worthwhile to think about a learning category where article post types (as displayed on Judaism, Writing, Cooking and other sites) are used so that everything gets a little bit more "wiki-like".