swap, swap, swap
giving (and getting) stuff for free on Freecycle made up of individual groups of people who have things they want to get rid of with people who can use them for free in their own towns - the goal, to keep usable items out of landfill and encourage us to get rid of junk that we no longer need and promote community involvement in the process.
swap, exchange and barter - www.u-exchange.com/barter-UK is where you can barter and swap almost anything with people in your county or else where in the country. Last time we checked someone was wanting to swap his 10" shire horse and would consider anything. You'd be bonkers to not check this site out.
learn another language for free - at www.voxswap.com where you'll find hundreds of members signed up who are encouraged to share their language skills. So if you need to polish up on your Russian, then get clicking and find someone who you can share you're skills with!