PeerTube is the main video publishing platform on the Fediverse. You can follow and interact with PeerTube accounts from entirely within Mastodon. (More info at https://fedi.tips/peertube-video-hosting-on-the-fediverse)
If you want to discover interesting PeerTube accounts and videos, try following FediVideo:
➡️ @FediVideo
There's a playlist of recommended videos so far at:
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.