The United Kingdom uses the Euro as a Complementary Currency
... but that is forbidden for all the other nations.
The Swiss complementary currency that Mr. Lietaer mentions is the WIR: http://wir.ch .
Other Swiss systems are the Kiss Zeit http://kiss-zeit.ch and the Zeitbörse http://zeitboerse.ch which are elderly care social currencies, the only two in the whole of Europe, copying and taking further the Japanese pioneer Fureai Kippu (which is a system of such currencies).
An even more developed system than the WIR, according to the professor, is the C3, implemented with the help of Bernard Lietaer in Uruguay ( http://www.c3uruguay.com.uy ) and Brazil ( http://www.compras.rs.gov.br ) with the help of the STRO Foundation ( http://socialtrade.org ), which is the developer of the open source complementary currency software Cyclos ( http://cyclos.org/products ), which now also offers a cloud based service.
Bernard Lietaer's articles: http://www.lietaer.com/writings/articles
Bernard Lietaer's books for Amazon Kindle.
The Terra trade reference currency, his own proposal for the world's B2B complementary currency: http://TerraTRC.org
Bank of England blows the whistle on the banking system: https://app.box.com/s/dl3hd7znpi5duifmnona
One of the best interviews with Bernard Lietaer: What about money?: