The Practical Chinese Reader was a standard for years. Simplified characters, PRC produced. It's still available, but it's vocab is a bit older. The texts and exercises are available spoken online for download to computer or to phone, but there's nothing interactive.
The PCR has been replaced by the ingeniously titled "New Practical Chinese Reader". Vocab's more up to date. In this case the readings, texts, are also available, I believe, on line, but my copy's on CD. Takes a minute to have the media player or CD ripper render them into something I can transfer to my phone. The New PCR presented a lot of the tone sandhi in more clear terms.
I haven't checked to see if any of the New PCR's exercises are available online. I'm pretty sure the readings are available online.
Most American-produced texts are very expensive. I like very cheap.
For additional reading there was an app on my phone that had glossed readings from current newspapers. You could pay for an upgrade, but while the status of some of the free readings would change there was material for free. Sort of handy, it would let me make a vocab list for review and had it spoken so I could mimic or just listen. I don't know if I deleted it or if my phone did one of its 23 trillion upgrades and detected and incompatibility and auto-deleted it. Maybe the app died and it self-deleted.
I liked the Cheng & Tsui Chinese character dictionary for making sure I got stroke order and something close to proportions right. It's for the "2000 most frequently used characters" but that's good for far more than 2000 words (since a lot of words use two characters and recycle the same 2k). There are perfectly serviceable online dictionaries. Not every word in Cheng & Tsui is that useful; and some useful words aren't in it. That's life.
I kept a copy of "A Practical Chinese Grammar for Foreigners" (Sinolingua) around. My rule for language learning is that any word I'm not at least 99% sure of at first sight gets reviewed and relearned, but anything grammatical that isn't crystal clear within a few seconds of seeing it gets checked. This is an atrocious grammar, but compared to grammars I've had to use for other languages (the late Soviet "academy" Russian grammar stands out as stunningly unusable), it's tolerable.
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