Hey there!
I'm building these stuff with all free tools that cost me 0$.
ReactJS & Nextjs- Front-end UI and SSR Firebase & mLab- Database Netlify- To host the React, Gatsby applications Netlify Function & Glitch- For APIs Material Design- For Nice Touch-up Zeit- To host nextjs application.
There are lot's of hacking tools I use.
If you wanna connect with me then I'm actively available the community called "Makers Kitchen( https://makerskitchen.xyz/ ", also on twitter https://twitter.com/mddanishyusuf and here is my portfolio https://mohddanish.me (yes, it needs lot of updates.)
I also love to connect with new peoples around the world through Skype or Google Hangout.
Thanks :)