wwine is a simple wine wrapper. It supports several flavours of wine (including vanilla wine, PlayOnLinux, lutris and crossover games+office). It provides a unified interface to all of the various flavours, complete with bottle support for all of them (including vanilla wine).
ClickyColoury is a graphical frontend for invoking Powershell scripts/tools. It provides a WPF-based interface, and implements a poor mans PSHost. It's meant as frontend to an asortment of administrative tools. Scripts written for the CLI run nearly unchanged due to Write-Host/Read-Host aliases. Additionally implements the "plugin meta data" for proper categorization of tools and extensions, with flexible support for additional input.
Frontend for Mednafen v0.9.x.x
QuickPlay is a graphical frontend for multiple gaming system emulators (MAME, MESS). It can manage and find ROMs, download new game engines, understands ZIP and other archive formats, virtual folder, drag and drop support, or backups.
VirtKick is a simple virtual machine and docker container manager. It provides a VPS orchestration web dashboard, based on Ruby Middleman, and a backend with a JSON API to libvirt/KVM. Virtual machines can be run across a local network of servers.
Attract-Mode is a GUI for game system emulators such as MAME, MESS and Nestopia. It abstracts the operating system, can be navigated per joystick, gamepad and spin dial. It's thus suitable for cabinet installations, works on Linux, OS X and Windows; is scriptable per Squirrel, provides a configurable menu, screensaver and background music, has a convenient history and play or score statistics.
MEWUI is a U.M.E. (MAME/MESS) user interface frontend. It extends the catalog browser, adds the full list of games, allows filtering, shows snapshots and cabinets in the selection menu, and adds an in-game mameinfo menu.
DBeauty is a database browser which visualizes relational structures and table/row interrelations. It can connect to an JDBC-supported SQL database, browser its content, navigate bidirectionally through tables, understands foreign key relations or user-defined connections, can generate SQL/DML, and execute arbitrary SQL queries.