If you’re on a very tight budget, it make seem impossible to make a difference in the world with no extra money to spare. But, much in the same way that you can use your frugal skills to reduce your spending and come up with clever solutions to financial problems, you can use those same skills to give back, even if your budget allows no wiggle room whatsoever. Here are 3 ways you can help others without spending a dime:

1. Click to donate. The Hunger Site is an innovative site that uses advertiser funding to benefit those in need. By clicking on the “Click to give” button once per day, you are taken to a page of advertisers that sponsor the site; the revenue from these advertisers is then donated directly to charity. As of this writing, The Hunger Site has given 745,818,023 cups of food since June 1999. They have several partner sites – The Rainforest Site, The Breast Cancer Site, The Child Health Site, The Animal Rescue Site, and The Literacy Site, which also which run off the same premise. By making a few clicks per day, you can donate a cup of food, 11.4 square feet of rainforest habitat, a free mammogram, and so on.

Many other sites utilize this concept to raise money for worthy causes also. Freerice.com is a unique, fun word game that uses sponsor advertising to fund 10 grains of rice donated through the World Food Programme for each answer you get right.

Also, I recently teamed up with P&G over on Contest Corner for their GIVE HEALTH program. If you click here and then click the donate button on my widget, P&G will donate one day’s worth of clean water to a person in need. If you’re a blogger, you can also apply to be a P&G GIVE HEALTH Blogger by clicking here.

I know there are many great sites like these that I’m missing, so please feel free to leave me links to your favorites in the comments!

2. Share your stockpile. You may not have any cash to spare, but if you clip coupons, you’ve probably hit some good sales where you were able to stock up on items for free. Food banks always need donations – and if you don’t have any extra food, remember that many food banks will also take toiletries and cleaning supplies. Shelters for the homeless, victims of domestic violence, and other similar organizations can also use these donations.

3. Volunteer. Donating your time costs nothing out of pocket, and can make a big difference. Perhaps you want to do something with a local organization – sites like Volunteer Match can help you find the right opportunity. Or maybe you’d like to do something creative and raise awareness and funds through your social networks or blog. It could even be something as simple as taking a casserole over to a neighbor who’s having a hard time.

In the past, I’ve felt limited by lack of time or extra money – if I couldn’t spend 30 hours volunteering or donate huge chunks of money to charity, it felt pointless. But making a difference isn’t about being in a special position – if all you have is 5 minutes to lend a hand, it means something. When I think about the scale of the world’s problems, I often feel like nothing I do could make enough of an impact. Then I remember that you can give a child one year worth of clean water for less than the price of a movie ticket, and feed someone with a simple click. I cannot change the world, but I can change one person’s world.

I know there are lots of other unique, creative ways to give back on a budget – and I would love to hear them, so please feel free to share in the comments!