Equip is a PSR-7 compliant Action Domain Responder (ADR) system. While it may look like a micro-framework (and it is), it is more like a wrapper around the real logic of your application domain. It's also PSR-1, PSR-2, and PSR-4 compliant.
Check out the source project here.
You will need Composer to install Equip.
Pick a project name, and use Composer to create it with Equip. Let's create
composer create-project -s dev equip/project equip-project
Confirm the installation by changing into the project directory and starting a development web server:
cd equip-project bin/serve
You can then browse to http://localhost:8000/hello and see JSON output:
You can also browse to http://localhost:8000/hello/nancy and see modified JSON output: