Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
Classic Shell - Classic Shell was developed for Windows 8 since that was the first version of the popular operating system to forgo the iconic Start menu.
Synapse - Synapse is a semantic launcher written in Vala that you can use to start applications as well as find and access relevant documents and files by making use of the Zeitgeist engine.
StartIsBack - StartIsBack returns Windows 10 and Windows 8 a real fully featured start menu and start button, behaving exactly like the ones in Windows 7. It's totally awesome and easy solution for your new Windows woes.
DockbarX - DockbarX is a standalone dock that groups and launches applications.
Start Menu X - Start Menu X with Start Button. Power users know how inconvenient and time-consuming it is to launch programs from the system menu.