ぱっと思いつくのはEmEditorですけど価格の面では……
参考:https://forest.watch.impress.co.jp/docs/news/1303059.html
076萌SNS is a social network, courtesy of 076. It runs on GNU social, version 2.0.2-beta0, available under the GNU Affero General Public License.
All 076萌SNS content and data are available under the Creative Commons Attribution 3.0 license.