Dynamic Brush Menus is a Blender add-on that provides fast access to brushes and tools in Sculpt and Paint Modes. The menu opens with the spacebar while you're working in either mode, keeping brush and tool selection within reach.
Originally authored by Ryan Inch (Imaginer), the add-on was part of Blender's 4.1 bundled add-ons and is now offered as it is, with limited support. It's compatible with Blender 4.2 LTS and newer, requires no special permissions, and is distributed under the GNU General Public License v2.0 or later.
The current release is version 1.1.10, published in May 2024, and the download comes in at a lightweight 14.9 KB. This release ships with no changelog. You can grab it from the developer's page and drag it into Blender, or install it from disk.