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I'm looking for a German dictionary that'll give me the following things for, of course, as many words as possible:
Wiktionary is okay, but it lacks many words.
Any recommendations? I'm open to both online dictionaries and commercial software.
I will try to split your question into three parts and answer them separately.
Some general remarks: unlike in English dictionaries, it is rather uncommon for German dictionaries to provide any phonetic transcription. Most German words (more than 95%) are just read according to simple rules and you don't need a special IPA case for every word. Duden, one of the most comprehensive and known dictionaries of German language, provides IPA only for small amount of foreign words. But many dictionaries provide the audio of pronunciation, so you can use this if you are not sure how to read the word correctly.
Concerning a free web dictionary that would suit your needs I would recommend using the BeoLingus dictionary. It has the following traits:
Here is a screenshot:
Down below you can easily navigate to word usages (example sentences), synonyms etc.
If you are looking for declination or word construction you can easily find them on related sites: just click on the word and you'll find all necessary direct links in the opened context menu:
If you can drop the English language from your criteria then you definitely should try Duden online. It is a monolingual dictionary (so, it is completely in German), but it provides all the information you need for understanding how to use certain German word:
Here is an example:
From all offline one language dictionaries I tried I liked Wahrig most, which is available both as software (rather outdated, unfortunately) and a printed book. This is somewhat more than just a dictionary and more like an encyclopedia, but still it contains valuable information on every word including pronunciation, grammar remarks etc.
Of course, there are also the complete Duden series of dictionaries, many of those are available in electronic form as well. I especially recommend the Bildwörterbuch (picture dictionary), which exists now in two editions: one for language learners and one for mere Germans (so-called "Band 3"). It is really very entertaining and educative, but it does not relate to your question...
Not a single source, but I like combining leo with the resources which are linked to the words (the 'info' button) you get to see. Includes, e.g., the aforementioned canoo.net.
Langenscheidt’s Professional-Wörterbuch Englisch software (for Windows, Mac or smartphones) looks like it might have the features you’re looking for, except the “Word Forms” tables giving all declensions only seem to be available for English headwords.
If you are using a Mac it might be good to know that macOS includes a digital version of the Duden. Just open the "Lexikon" (German system) or "Dictionary" (English System) app which you easily find using Spotlight.
The Dictionary app includes high quality dictionaries for all major languages, but they need to be enabled in the app's preferences.
This site does not answer all your questions, but as a native German speaker I find it useful, so it might be useful to you too: www.canoo.net
I am categorizing answers here. I am sorry but mobile dictionaries are iPhone/iPad-biased, you could suggest other-platforms-biased edits if you need them.
Essentials
Comparison
ONLINE: Dictionaries and some Grammar
