What it is: This check-in app provides a fast, professional, and secure alternative to Excel or paper event guest lists. Get the app: App Store. The Expensify app is a great tool for expense report management, receipt and mileage tracking and overall budgeting for business travelers. Tripit provides real-time flight alerts, allows you to locate alternate flights and even alerts you when better seats become available. A lead-capture solution designed for trade shows and conferences, this app can capture and qualify leads, electronically distribute collateral, and accelerate leads through the sales pipeline while offering real-time data measurement. Eventbrite What it is: A platform to create an event, promote it, and sell tickets.