If you had to start a SaaS with $0 what products/tools would you use?
You're stranded in a foreign country..you have no documents and can't leave..you know nobody, have nothing (except a laptop, an internet connection and decent coding skills) you have no memory of how you got here..you know only one thing..the only way you get out is.. if you can successfully pull off a SaaS and make enough money to buy yourself a new identity :)
How would you build a SaaS with $0? :)
Well if you have internet connection, then you should surely checkout all the Free Stuff Internet grants like https://awesome.re, https://github.com/ripienaar/free-for-dev, https://medium.com/swlh/300-awesome-free-things-e07b3cd5fd5b, http://startupstash.com, etc... & use whatever resources that are needed for the SAAS you want to build
My tools would be these: the internet, my telephone, and my email account.
Use those to find potential customers. Here's how...
I would talk to business people, get to know them, earn their trust, be helpful, all with an eye toward finding out what they urgently need + are willing to pay me to deliver. Next, capture their pre-payments, then build the thing using whatever (free and non-free) tools are necessary and palatable and/or reasonable within the budget parameters established by those pre-payments.
No presales yet?
Keep talking to customers.