Godot Engine - Feature-packed 2D and 3D open source game engine.
OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Freebiebucket - Curated free tools & resources for makers 🛠
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
GetSiteControl - Website popup builder & email marketing suite for ecommerce