Here are some of the latest apps available at the Apple App Store for the iPhone, iPad, iPod touch, and/or Apple Watch.

Jumpin’ Labs has released Geronimo for the iPhone and Apple Watch. It’s a gesture-based, mobile email app.

Pinkerton Road Studio and Phoenix Online Studios have announced that Gabriel Knight: Sins of the Fathers 20th Anniversary Edition, Jane Jensen’s remake of the 1993 classic Sierra hit, is available now for the iPad. It’s an US$2.99 “moody, mature murder mystery.”

ZenBrains has introduced Swipeout! The free game is a combination of a mind-provoking puzzle and a quick-reactions game, in which players need to act quickly as well as think strategically and tactically.

iThinkdiff has launched Math Mastery Multiplayer. The free game provides players with seven math problems involving addition, subtraction, multiplication, and division. When the player figures out the answer to each problem, they then have to find the answer in a grid of numbers.

Sascha Rank and Philipp Kosicki have teamed up for The Flapening. The free game’s main character is Flap, a tiny red bird fighting against gravity.

Qbikal Software has unveiled Verba 3D. The free app allows anyone to add 3D text effect to any photo from their camera roll and share it on Instagram, Facebook, Twitter, Tumblr, or any other social media platform.

Andrew Kaz has rolled out Storyteller, which provides a new interface for Audiobooks on the iPhone. The US$2.99 app was made so that you can hear a story read by a narrator.

Calvino Noir has created Calvino Noir. The $3.99 stealth game takes players on a journey through the underworld of 1930s Europe with stylistic side-scrolling gameplay, a dark and foreboding visual style presented in shades of grey, and multiple paths and characters to explore.