Geomys
geomys.org
Firm of professional open-source maintainers that companies hire on retainer to maintain critical Go projects.

Zero-config tool for making locally trusted development certificates.
Zero-config tool for making locally trusted development certificates. mkcert is a developer tools product built by indie maker Filippo Valsorda.
geomys.org
Firm of professional open-source maintainers that companies hire on retainer to maintain critical Go projects.
age-encryption.org
Simple, modern file encryption tool, library and format.
filippo.io
Web tool for checking whether a server is vulnerable to the 2014 Heartbleed OpenSSL bug.
mkcert is a developer tools product: Zero-config tool for making locally trusted development certificates.
mkcert was made by Filippo Valsorda, Go cryptography maintainer; founder of Geomys, a firm of professional OSS maintainers. Filippo Valsorda has also built Geomys, age, Heartbleed test.
Yes. As far as IndieMakerList knows, mkcert is still active and run by Filippo Valsorda at mkcert.dev.
marsx.dev
SaaS builder that unites no-code, pro-code, AI and micro apps.
messwithdns.net
Interactive playground for experimenting with real DNS records.
memory-spy.wizardzines.com
Tool for running programs and inspecting their memory.
nginx-playground.wizardzines.com
Test nginx configurations instantly in the browser.
integer.exposed
Visual explorer for how computers represent integers.
sizzy.co
Browser for web developers with synchronized devices, project workspaces, isolated sessions, debugging and coding agents.