Тут можно купить ISBN напрямую физлицу. Стоит четыре килорубля...

A Q&A platform software for teams at any scales. Whether it's a community forum, help center, or knowledge management platform, you can always count on Apache Answer. - apache/incubator-ans...

The screenshot looks nice.

• https://github.com/apache/incubator-answer

Programs and writings.