Looks like the Apache Tuscany Project has been retired. Not sure what that really means, but there are still quite some Opensource and Vendor specific implementation using SCA. If this standard isn't supported anymore is there any other alternative out there ? Also I don't get why SCA hasn't been used as the main binding for Microservices, because they are kind of the same as SCA Components/Modules.
Regards
On
Unfortunately Oracle blocked passage of the specifications at OASIS (you will have to ask them why since they never explained the reason for their vote to the specification committee).
Fabric3 (fabric3.org) is an active open source project that supports SCA and is used for a number of microservice-based architectures. You may want to look at that.
Sadly SCA didn't hit the industry as the council was expecting and that's why they decided to archive it. Currently WebSphere Application Server 8.5 supports it, but since the Apache project is not supported anymore I cannot guarantee long term support.
As for services, my advise is that you go with the standard well-known specs like SOAP and REST.