Bottles is described as 'application designed for elementary OS (but works on all GNU/Linux distributions), which helps in managing wineprefix' and is an app in the Gaming Software category. There are more than 10 alternatives to Bottles for a variety of platforms, including Linux, Mac, Wine, Windows and Android. The best alternative is Wine, which is both free and Open Source. Other great apps like Bottles are RetroArch (Free, Open Source), Lutris (Free, Open Source), PlayOnLinux (Free, Open Source) and Proton (Free, Open Source).
Wine is a free, open source application for running Windows software on operating systems that are normally not supported. With Wine, you can install and run these applications just like you would in Windows.
What is RetroArch? RetroArch is a modular multi-system emulator system that is designed to be fast, lightweight, and portable. It has features lacking in some emulators frontends, such as real-time rewinding and game-aware shading. What systems does it play?
Unified library for all your games. Features GameHub allows to view, download, install, run and uninstall games from supported sources. Games GameHub supports non-native games as well as native games for Linux.
Pegasus is a graphical frontend for browsing your game library (especially retro games) and launching them from one place. It's focusing on customizability, cross platform support (including embedded devices) and high performance.