Keypirinha is described as 'A lightning fast and flexible keystroke launcher for Windows. No installation required (portable). Extensible with Python3 plugins' and is a very popular application launcher in the online services category. There are more than 100 alternatives to Keypirinha for a variety of platforms, including Windows, Mac, Linux, File Explorer and iPhone apps. The best Keypirinha alternative is Microsoft PowerToys, which is both free and Open Source. Other great apps like Keypirinha are Flow Launcher, Listary, Vicinae and Alfred.
Cerebro is an open source and free electron-based productivity software alternative to Alfred and Spotlight. It is focused on speed and good UI and UX. In most cases you don't even need to open another application, because you can see results right in Cerebro, like google...
A multi purpose launcher and more advanced and customizable freeware windows run replacement and more. Executor is available also as a portable app and can be integrated in LiberKey.
QuickFind is a unified search tool providing instant access to files, apps, and web pages. It supports major search engines such as Google and Bing. Seamlessly switch between local and online content, and categorize searches into files, photos, music, and videos.
Albert is a C++/Qt based desktop agnostic keyboard launcher that helps you to accomplish your workflows in a breeze. Its goals are usability and beauty, performance and extensibility.
SyMenu is a portable menu launcher and a Start Menu replacer to organize your applications quickly and easily. But the real power of SyMenu unfolds when you approach its integrated large and daily growing suites of more than 1.500 freeware programs.
FARR also lets you quickly run web searches, send email, manipulate files, control on-screen windows, and much more. Build and share custom commands or install plugins to add tons of new features, like live search features for your clipboard history and your internet bookmarks;...
EverythingToolbar is integration for the Windows taskbar to use "Everything" which is an administrative tool that locates files and folders by filename instantly for Windows.
It's Lightweight & Simple
GNOME Do allows you to quickly search for many items present on your desktop or the web, and perform useful actions on those items.
Spotlight is the system-wide desktop search feature built into Apple's OS X operating system since version 10.4 (Tiger). Backed by an index of all items and files on the system, it's designed to allow the user to quickly locate a wide variety of items on the computer...
Seek, peek, and preview to find your work instantly — even if it's buried in folders, or you've lost track of it over the months.
Rofi started as clone of simpleswitcher, written by Sean Pringle a popup window switcher roughly based on superswitcher. Simpleswitcher laid the foundations and therefor Sean Pringle deserves most of the credit for this tool.
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if not using windows but linux this is what you would like to use