Global Village Construction Set is one of the most innovative and constructive projects we have seen in recent years. GVCS, set up by Marcin Jakubowski, have identified the 50 most useful tools for creating land varying from construction tools to land working tools and designed them to be constructed from standardised parts and released all the plans open source so that anyone can make one of these tools if they so wish. Only a few made at the moment but more to come.
You can build a GVCS machine for on average an eigth of the cost of buying a new machine. This is seriously a project to keep an eye on with future developments.