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A slew of popular iOS and Mac apps updated, launched, or went on-sale recently, and 9to5Mac gathered the most noteworthy ones in our usual round up below. Today’s crop includes the iOS Kindle app expanding its offering for children, iAnnotate PDF for iPad beefing sync options, dJay and Gemini for Mac slashing their price tags by half, Sparrow for Mac going Retina, and more.

Check them out:

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Cabinet PDF Reader by Com Tec Co for iPad: 

This is not an app update, but the creators of Cabinet PDF demonstrated their application to us at WWDC, and we were blown away. The application is very polished and introduces some neat new user-interface elements; ones that are super helpful for PDF reading, organizing, and editing. Perhaps the best UI element is the dynamic annotation pallet. A user simply puts their finger down on the iPad display, and more options will spring out. It is very cool, and it is something you have to see in the demo video to understand. The app is very simply to use, offers wireless PDF transfers (over Bluetooth + Wi-Fi), great performance, and intuitive browsing views. Because of its vast feature set, unique interface, and ease of use, we recommend that PDF readers and editors try Cabinet. It is available for $2.99 on the iPad. The Cabinet for iPad app rates 4.5-stars, based on more than 300 user reviews, as of press time.

Scoople by Digest for iOS: 

We also saw this app at WWDC: it is a unique news reading application that aggregates different types of news into channels. For instance, there is an Apple section, a general technology section, a celebrities section, and others. The unique part about Scoople is its game-like feature that asks users their opinion on the news stories each day. A leaderboard is even present based on user selections.  The Scoople for iOS app rates 4 stars, based on more than 15 user reviews, as of press time.

Kindle by Amazon for iOS:

This free app updated to version 3.1 today. The latest improvements include bug fixes for compatibility issues, but the folks at Amazon most notably added over 1,000 children’s titles for iPad users, as well as a better reading experience with smaller margins and a cleaner look. The update also brought Search for quickly locating content by title and author, which is available to all iOS users, and it fixed a word lookup issue in Google and Wikipedia. The Kindle for iOS app rates 3 stars, based on more than 167,000 user reviews, as of press time.

iAnnotate PDF by Aji for iPad:

This $9.99 app, which lets users annotate and share their PDFs, launched version 2.2 yesterday. The update features “better file management and synchro- nization features,” including: Box OneCloud for markups and sending documents to Box’s collaborative OneCloud ecosystem; Dropbox, Box, or WebDAV support; a redesigned library interface; and, faster rendering and better optimization for stability and reliability. The iAnnotate PDF app rates 4.5- stars, based on more than 5,800 user reviews, as of press time.

dJay by algoriddim for Mac:

No update to report, just one awesome sale. This pricey app, which transforms a Mac into a “full-fledged DJ system, allowing you to mix your iTunes music library on a hyper-realistic turntable interface,” is now touting a 50 percent discount for a limited time. For just $9.99, users get access to the full bevy of audio-mixing features. The dJay for Mac app rates 4.5- stars, based on more than 300 user reviews, as of press time.

Gemini: The Duplicate Finder by MacPaw for Mac:

Another sale: This $9.99 app is boasting a 50-percent discount to celebrate summer. Now, for just $4.99, users can quickly find and remove duplicate files from their Mac. The Gemini for Mac app rates 4.5- stars, based on more than 500 user reviews, as of press time.

Sparrow by Sparrow for Mac:

This $9.99 app updated today with Retina graphics and Mountain Lion support. Read more about the latest version in our full coverage at 9to5Mac.

Google+ Local for iPhone and iPod touch: 

As we noted on 9to5Google, Google swapped its Google Places iOS application for a new Google+ Local app. The app takes in parts of Google Places, Google+ business pages, and Zagat, and it also features an improved user interface. In addition, the free application update offers a handy voice search function, bug fixes, and more.