I'm really using MaxLauncher in the absence of something like the one suggested in my original post. However, the fact that its keys are fixed makes visual agility and customization limited.

I am grateful for the other suggestions, they are very interesting and arouse some unexpected ideas, but they will certainly be useful for those who have preferences different from mine. I'm following with MaxLauncher now, still encountering some problem with performance, the launcher doesn't appear whenever requested. But this is what is there for now.

I really hope that the developer of the SiteLauncher addon will take a look here or someone who can emulate it on the desktop ... even if it looks like something it shouldn't look like

I don't know SmarTaskbar, but using Autohotkey (AHK) you can get 3 behaviors for the Windows taskbar, one of which may be what you expect.

1º - AHK Code for hide/show the Taskbar with a key combination
!t::     ;"!" is Alt key and "t" is T key 
   WinExist("ahk_class Shell_TrayWnd")
   t := !t
   If (t = "1") {
      WinHide, ahk_class Shell_TrayWnd     ;hiding Taskbar
      WinHide, Start ahk_class Button     ;hiding Start button
   } Else {
      WinShow, ahk_class Shell_TrayWnd     ;unhiding Taskbar
      WinShow, Start ahk_class Button     ;unhiding Start button
   }
return

2º - AHK Code for keep the Taskbar hiden if your program is active.
Loop
{
IfWinActive, SmartTaskbar.exe     ;I guessed the EXE name, but you will have to make sure of that.
WinHide, ahk_class Shell_TrayWnd     ;hiding Taskbar
WinHide, ahk_class Shell_TrayWnd     ;hiding Taskbar
}
Return

3º - AHK Code for keep the Taskbar displayed if any other program is active, except yours.
Loop
{
IfWinNotActive, SmartTaskbar.exe     ;I guessed the EXE name, but you will have to make sure of that.
WinShow, ahk_class Shell_TrayWnd     ;displaying Taskbar
WinShow, ahk_class Shell_TrayWnd     ;displaying Taskbar
}
Return

Hi,

Does anyone develop or know any launcher for Windows that is as similar as possible to the SiteLauncher add-on for Firefox and Google Chrome browsers?

Since I don't want to launch websites but folders, files and applications, what I found closest to now was Madproton's MaxLauncher, but unfortunately it has a limited number of keys and little visual customization.

Besides, I was hoping for something like this...