Being independent of the desktop type has its drawbacks: Recoll desktop integration is minimal. However there are a few tools available:
Users of recent Ubuntu-derived distributions, or any other Gnome desktop systems (e.g. Fedora) can install the Recoll GSSP (Gnome Shell Search Provider).
The KDE KIO Slave was described in a previous section. It can provide search results inside Dolphin.
If you use an oldish version of Ubuntu Linux, you may find the Ubuntu Unity Lens module useful.
There is also an independently developed Krunner plugin. It is now integrated in the Recoll source.
Hotkeying recoll: it is surprisingly convenient to be able to show or hide the Recoll GUI with a single keystroke. Recoll comes with a small Python script, based on the libwnck window manager interface library, which will allow you to do just this. The detailed instructions are on this wiki page.