Carla is a fully-featured audio plugin host, with support for many audio drivers and plugin formats. It's open source and licensed under the GNU General Public License, version 2 or later.
Carla is also available as an LV2 plugin and VST2 plugin.
Note: While the software is classified as free, it is actually donationware. Please consider making a donation to help support development.
Updated on Aug 23 2021