Well just for example,
I am a CPA and I have a small tax practice, I would happily give advice or do tax returns business and personal on trade for all sorts of things. Right now, I would love to trade services with a lawyer to look for he purchase agreement on my house.
I would do a return or a few returns for some one to help me set tile in my bathroom, cut down a tree in my yard, or what ever else some one has to trade. I also have various fancy yard equipment (gas trimmer, pressure washer, snow blower) I have acquired for free and fixed up, although I am selling my house, so I will need to find a new home for these types of things. I think I do a pretty good job not owning things, but I still end up with stuff that gets used rarely, I am sure that is the case with almost every one here.
Other skills I have, I can do rudimentary bike repairs and am more than happy to work through complicated ones with any one wanting a partner or some one to bounce ideas off of in the project.
I can diagnose and fix most small engines problems.
I do not own very many specialized tools, but I have a lot of general things to a considerate and caring borrower.
I have an extra bike that I use for guests a week or two a year that could easily be used for other peoples guests.
Those are some examples, I am sure there are more but that is a rough cut of the idea any way.