* https://paddle.com - Paddle (payments) - selling internationally without having to deal with all the local taxes
* https://uxwizz.com - UXWizz (analytics) - built my own private, self-hosted analytics platform that provides everything I need (stats, event tracking, session recordings, heatmaps, a/b tests, etc.) in a single platform that doesn't cost thousands per month
* Gmail - Like it or not, I got used to using gmail to handle customer support requests (I use the auto-labeling features to keep them categorized) and the SMTP forwarding to send/receive emails using my own domain names. I am thinking of moving away (for privacy reasons mostly), but it works really well at the moment.
* DigitalOcean/Contabo for VPSs for self-hosting everything that I need
This is mostly it, I try to stay as lean as possible. Self-hosting is pretty easy nowadays and it rarely needs maintenance, so I usually prefer it because of the control over the product/data and the cost reduction that it gives.
* https://paddle.com - Paddle (payments) - selling internationally without having to deal with all the local taxes
* https://uxwizz.com - UXWizz (analytics) - built my own private, self-hosted analytics platform that provides everything I need (stats, event tracking, session recordings, heatmaps, a/b tests, etc.) in a single platform that doesn't cost thousands per month
* Gmail - Like it or not, I got used to using gmail to handle customer support requests (I use the auto-labeling features to keep them categorized) and the SMTP forwarding to send/receive emails using my own domain names. I am thinking of moving away (for privacy reasons mostly), but it works really well at the moment.
* DigitalOcean/Contabo for VPSs for self-hosting everything that I need
This is mostly it, I try to stay as lean as possible. Self-hosting is pretty easy nowadays and it rarely needs maintenance, so I usually prefer it because of the control over the product/data and the cost reduction that it gives.