Tripadvisor - The Tripadvisor mobile app is available for the Android and iOS platforms. It can be used to create reviews of hotels, restaurants, and to chat with other travelers on Tripadvisor forums.

Twicca - Twicca is a Twitter client for Android that is simply awesome. Features: * Notification

Wikivoyage - the free worldwide travel guide that anyone can edit.

Tweedle App - Notion is nice but sometimes all you need is an app like Tweedle.

The Basetrip - Cities - Travel information for 650+ cities & 230+ countries

HootSuite - Enhance your social media management with Hootsuite, the leading social media dashboard. Manage multiple networks and profiles and measure your campaign results.