It's Apple Watch day. And whether you received one already, or are stuck waiting a few weeks for it, you'll want apps to make the most out of your new wearable when the time comes. Thankfully, we here at Engadget are always thinking about you, the reader, so we've put together a list of third-party apps that stand out from the 3,000-plus expected to be available at launch. But first, let's talk about some essentials. The Twitter and Instagram Apple Watch apps, for starters, will let you check out tweets and view photos right on your wrist, among other things. Sports fans, meanwhile, have access to apps like ESPN, MLB At Bat and NBA Game Time, which makes it easy to keep up with scores without having to pull out your iPhone.