Tools for Self Reliance refurbish tools in the UK then send them to communities in Africa.

Workaid have area organisers who can collect tools from you. Their website has a list of types of tools that are currently in most demand. They also mainly support communities in Africa.

Tools with a Mission also collect tools for developing countries.

Toolshare is part of the Freeconomy network, and anables you to offer tools for loan to people in your area - or borrow ones you don't have from other people. There doesn't appear to be a central register of Toolshare initiatives round the UK - search for one in your local area by inputting "toolshare" and "<your location>" into your search engine.