Conjugations and Declensions
I wish there were a way here to enter a word in any form and then have all the forms of the word returned with example sentences. Translation would not be needed, but rather complete conjugation and declensions. Sentence examples need not be translated either, but there should be a complete set of sentences to show all usage.
For instance, I see a word in past tense, пробовал, and want to know what its present tense first person is, the software would return, пробую. And if I request the infinitive, the software would return пробовать (imperfective aspect) and попробовать (perfective aspect), and then if I request the conjugated table, the software would return 45 forms (in the case of пробовать) of the verb shown in classes of the 11 tenses, and if I request examples in sentences, the software would return 45 sentences. If I request explanations, it would do that as well.
It would be a huge project. But Duolingo is only good for building vocabulary and a rudimentary understanding of grammar.
Or would this be a good idea?
Try wiktionary. If I search there for 'пробовал', it identifies it as the 'masculine singular past indicative imperfective of про́бовать', If I follow the link to про́бовать and expand the conjugation table, I can see that the first personal singular present tense is про́бую. There is a link to the perfective version попро́боват, with its own conjugation table.
If I was going to wait for duolingo to have integrated dictionary functionality as good as that, I wouldn't hold my breath.
It's a bit old-fashioned in its layout, but this site gives you exactly what you're asking for, based on the analysis by Zaliznyak (look on the left of the page for a link to an English article about him). Note that where the accent falls is marked on this site, which makes it more useful for non-Russians than sites where the accent is not indicated. (Also note that to enter ё always enter е).
That site may be a work in progress. But I'll keep the site in mind, and perhaps try again. I entered two words -- пробовал and пробовать and they system returned an error:
An internal error was detected in the service software. The diagnostics are being emailed to the service system administrator (root).
Occasionally the database has been down in the past, but it returned w/in a day or less on those couple of occasions. Let's hope the site is not being neglected now. As I said, it's just what you're asking for, as far as morphological analysis goes.
[Added] There's a wikipedia article about the founder of that site in Russian, English, and other languages.