Ask HN: Which tools/services do you recommend when building a SaaS?

Besides the usual services like Stripe etc. which most will likely recommend, I would highly suggest you look at http://fairpixels.pro these guys are the best I know of when it comes to helping companies design beautiful b2b saas UX/UI.

I think you should use the tools/services whichever gets your job done the fastest. First get the MVP out their. Beauty comes later.

Depends on what exactly you need. Ideally you should be focusing on building only the core of your product yourself and outsourcing the rest to other service providers. Ex: billing + invoicing to a reseller, hosting to an IaaS service etc.

If you are asking about specific development tools/libraries, again I suppose it would depend on what exactly you are building.