Within Fiji, click the menu Help > Update and click the button Manage update sites.
Activate the update site NEUBIAS.
Enter a search-term within the search field of the Fiji main window and activate the BioImage Informatics Index checkbox.
This work is BSD2 licensed. It is free and open source.
The BIII search plugin project is open to contributions and feedback. Just create a github issue and get in touch.