Deployment & Hosting Platforms
gigalixir.com
Gigalixir provides one free instance that never sleeps and a free-tier PostgreSQL database limited to 2 connections, 10, 000 rows and no backups for Elixir/Phoenix apps
codenameone.com
Open source, cross-platform, mobile app development toolchain for Java/Kotlin developers. Free for commercial use with an unlimited number of projects
anvil.works
Web app development with nothing but Python. Free tier with unlimited apps and 30-second timeouts
configure.it
Mobile app development platform, free for two projects, limited features but no resource limits
Encore
Open-source TypeScript backend framework for robust type-safe applications.  
telegra.ph
Easily create web page using Quill
pipedream.com
An integration platform built for developers. Develop any workflow based on any trigger. Workflows are code you can run for free. No server or cloud resources to manage
Cycle.io
DevOps platform for building platforms. Handles container orchestration, load-balancing, monitoring, and more
TestApp.io
Your go-to platform for ensuring your mobile apps work as they should. Free plan: one app, analytics, unlimited versions & installs, and feedback collection
Platform.sh
Continuously deploy full-stack apps
readthedocs.org
Free documentation hosting with versioning, PDF generation, and more
Awardspace.com
Free web hosting + a free short domain, PHP, MySQL, App Installer, Email Sending & No Ads