Hi Sjoerd,
Could you clarify the question?
By definition stand alone engine management are flexible, configurable engine management units which can be used in any situation street/race/whatever. By 'street use' do you have a particular requirement you are trying to fufil? Please elaborate.
For what its worth I use a LinkG4. It seems they have a dealer in Belgium ->Custom Import Arts, Servaas Daemsstraat 83, Noorderwijk 2200, BELGIUM