Harry's LapTimer

• Harry's LapTimer Grand Prix Edition is required for VBOX Sport connection
• Records all types of sensor data provided by your iPhone/iPod/iPad (or external sensors)
• Fully Automated GPS-based Lap Timing
• Video Processor
• Online database with more than 450 predefined tracks

More info and screenshots
View in iTunes

Race Chrono

• Lap timer for circuit and point-to-point tracks
• Gauge view of live data
• Analysis mode with configurable graphs
• Lap list with optimal lap time calculation
• Exporting to CSV and NMEA
• Bluetooth GPS support for superior accuracy over internal GPS
• Support for VBOX Sport
• Currently free

More info and screenshots in Google Play

Solo Storm

SoloStorm for Android v2.2+ devices allows you to log and analyze GPS, OBD-II, Sensor and Video data all on your smartphone or tablet.

• Jog maps, data and videoAutomated sectional analysisOverlay video and data on the device
• Compatible with both phones and tablets
• Open licensing (run on as many devices as you want)

More Info

Porsche Track Precison

• Only for 911 GT3 (type 991)
• Live display for lap and sector times
• Video recording and analysis
• Racing stats, speed curve, plotting of detailed driving data (e. g. steering angle, brake pressure, lat/long acc, fuel consumption)
• Compatible with VBOX Sport for improved GPS
• Analysis in Circuit Tools possible
• free

View in iTunes
More Info

iLapTimer

• GPS Lap timer and race data acquisition software
• Perfect for time trial, track day and competition
• Shows current lap time, best lap time and previous laps automatically after each lap
• Allows the sharing of lap times on Facebook, Twitter, Instagram, WeChat and Weibo
• Built-in tracks
• $14.99

More info and screenshots
View in iTunes