Playnite

Playnite is an open-source video game library manager software with one simple goal: To provide a unified interface for all of your games. Import popular games libraries from Steam, Origin, GOG Galaxy, Battle.net, and Uplay services, including games that are not installed! Windows Store (UWP) games are also supported. Finally, a program to display your whole games library, easily and elegantly. Playnite is developed to put your favorite games to the foreground, but also improve your gaming experience, where other programs act just as launchers.

Features and Highlights

Extensions
Playnite can be extended with plugins (written in .NET languages) or by scripts (PowerShell and IronPython are currently supported).

Fast
Playnite's user interface is fast and light on resources, even with large libraries.

Safe
The app doesn't store any user information. It stores the same amount of information as a web browser when linking accounts (cookies).

Emulation support
The software supports a wide variety of console emulators.

Fullscreen mode
Fullscreen mode with full controller support is available.

Portable
The app can run from portable storage with the option to configure the database location for automatic sync via services like DropBox or Google Drive.

igdb.com integration
The program can automatically download metadata for all of your games, including custom ones (covers, descriptions, and other information).

Themes
The tool's look can be fully customized, from simple color changes to complete layout re-designs.

Playtime counter
The app tracks your time in-game (any game including emulated ones) and can also import your playtimes from Steam and GOG.

Completely Free
No Play nite features are locked behind a paywall and the complete source code is available under the MIT license.

Note: Requires .NET Framework.