Top Alternatives to Quicksilver

Alfred is a productivity application for Mac OS X, which boosts your efficiency with hotkeys, keywords and text expansion.

GNOME Do (often referred to as Do) is a free application launcher for Linux

Listary an advanced search tool that enables you to find anything.

Find and Run Robot (FARR) is a program for keyboard maniacs -- it uses an adaptive "live search" function to rapidly find programs and documents.

RecentX is a launcher for Windows designed to make your computing life joyful.

Executor a multi purpose launcher and windows run replacement.

Keypirinha is a fast launcher for keyboard ninjas on Windows.

LaunchBar is an application launcher for macOS. It provides access to users applications and files, by entering short abbreviations of the searched items name. It uses an adaptive algorithm that learns a users preferred abbreviations for a particular application.

Enso Launcher is designed to give you instant access to your applications and windows.

Keyboard Maestro is a closed-source commercial macOS-based application that allows automation of routine functions, such as navigating running applications, opening documents, typing text, expanding abbreviations, and controlling web applications.