Naïve list gathered with grep. Let's make using each of these usable, standalone, in a PSR-7 centric app, or just check if there is something to do, or decide to not do it.

May handle PSR-7:

• Bridge/Doctrine (see Dual PSR-7 + HttpFoundation support on a component by component basis #15414 (comment))
• Bridge/Monolog
• Bridge/Swiftmailer (see Dual PSR-7 + HttpFoundation support on a component by component basis #15414 (comment))
• Bridge/Twig
• Component/Asset
• Component/Debug (see [Debug] PSR-7 support #15415 and [Debug] Deprecate ExceptionHandler::createResponse #15418)
• Component/Form
• Component/Routing
• Component/Security/Core
• Component/Security/Csrf (see Dual PSR-7 + HttpFoundation support on a component by component basis #15414 (comment))
• Component/Security/Http
• Component/Translation (see Dual PSR-7 + HttpFoundation support on a component by component basis #15414 (comment))
• Component/Validator (see Add PSR-7 support for FileValidator #15421)

May not handle PSR-7:

• Component/HttpFoundation
• Component/HttpKernel
• Bundle/DebugBundle
• Bundle/FrameworkBundle
• Bundle/SecurityBundle
• Bundle/TwigBundle
• Bundle/WebProfilerBundle