List of free devtool stuff for developerππ½
If you're looking for all programming tools around devtool (not just free). Check this page List of devtool Programming Tools

DevPal
DevPal is a set of many online developer tools that make developers' everyday work productve
Tag: url-encoder, text-editor, devtool, json, image, generator, encoder, decoder, formatter, productivity
Responsively
A must-have DevTool for all Front-End developers that will make your job easier.
Tag: devtool, web-development, productivity, responsive, browser
Mirrored User-interactions across all devices. Customizable preview layout to suit all your needs. One handy elements inspector for all devices in preview. 30+ built-in device profiles with option to add custom devices. One-click screenshot all your devices. Hot reloading supported for developers.
YepCode
All-in-one platform to connect APIs and services in a serverless environment. It brings all the agility and benefits of NoCode tools, but with all the power of use programming languages
Tag: Saas, PaaS, serverless, API, workflow, devtool, automation, code, productivity, JavaScript
Credit: 1.000 yeps/month Processes: up to 5 by team Integrations: up to 3 by team Time by execution: 5 minutes

Free PO editor
Free PO editor is a free online tool for translating Gettext PO files
Tag: text-editor, devtool, cloud-text-editor, i18n, localization

Polypad
Polypad is scriptable textpad for macOS & Windows. Quickly transform, parse, or generate text using the textpad.
Tag: textpad, devtool
Custom Scripts Cross-Platform Community Support Scriptable Textpad for developers. Simply download Polypad to start transforming text