As an entrepreneur, any opportunity to earn extra cash while building a career is a bonus. That doesn't have to stop while traveling away from the office, either. Not only are there potential marketing and networking connections, monetary opportunities are also viable -- all from your touchscreen.

These six apps allow you to earn cash while you're business traveling. While these apps probably won't earn you a full-time income, they can take you to new places and earn you a few extra bucks to treat yourself. These iOS and Android friendly apps can also inspire you to grow your business.

1. Clarity

If you're an entrepreneur, innovator, or business owner (I suspect many of you are), you should consider downloading Clarity. This app lets you mentor people via a telephone call at a price set by you. This is a great option if you're looking to make money and help someone out, especially during airport wait times or downtime in the evening.

2. Gigwalk

Gigwalk is a marketing, research, and consulting company that pays users to ensure that its clients' products are being presented well. As a user, you may search for "Gigs" in your area. From there, you can apply to perform the gig, which can be anything from verifying product displays in a store to ensuring that a marketing event contains certain materials.

Gigs are verified through geotagged photos (though this may vary) and can take anywhere from a few minutes to a few hours. The $3-$100 gigs are paid through PayPal once the work has been completed and approved. Field Agent is similar to Gigwalk but is also available in several countries, including Canada, Australia, and the United Kingdom.

3. Airmule

If you're traveling between the U.S. and China and have space to spare in your luggage, you could consider checking out Airmule. This app pays you to transport Airmule Travel Boxes from one selected airport to another. You'll know exactly what you're transporting as an onboard courier as well, so you don't have to worry about illegal activities.

To see if you qualify, enter your flight information to see if there is a match with items needing shipping. If there is, you pick up the box at the airport two to three hours before departing. When landed, you simply leave the box at the destination airport. You can earn up to $500 via direct deposit for your services.

4. Roadie

If taking road trips is more your speed and you have room to transport items, this can be a great app to try. Users can post gigs on Roadie, which involve driving items (or even pets) from one place to another. Locations aren't limited to a specific area either. Items can be requested to be driven across the city or across the country.

Drivers can earn up to $50 through local gigs and $650 on long-distance treks while bonuses apply for carrying pets. Drivers receive roadside assistance and are given advance notice of the pickup and drop-off locations.

5. Foap

Why not earn a little cash for the photos sitting in your storage? With Foap, you can make a portfolio of photos that anyone can purchase for $5 each. Or you can submit your photos to one of Foap's themed missions that could earn you anywhere from $100 to $2,500. Your photos may be picked up by Getty, Adobe, or Shutterstock (partners of Foap), earning you even more.  

6. Turo

You've probably heard of Airbnb (another option for making some money), so how about the same concept but with cars? Turo lets you rent out your car to users for a price set up by you. Your vehicle is insured for up to $1 million in liability insurance.  

You can also rent out your parking space with apps like JustPark. 

Making money while traveling is definitely possible. These are only a few examples of how you can earn cash while still furthering your career. Apps are added and updated often, enabling innovation. I don't think this industry will be slowing down anytime soon.