I just found a related feature-request

How do I add a Filtered Question to search for questions containing content other than just tags?

Besides the mandatory tag, it only had filtering.

I will update the below text later.

Assuming that I was right regarding that, it's not possible to create filter for questions based on the question and answer content and considering that there isn't a specific tag for what I'm looking for, in this case, for asking for a site recommendation to ask questions about application software, the workaround is to set a broad filter, i.e., all questions from Meta Stack Exchange, then use client-side (email client, RSS client) filtering features.

Other workarounds imply using other tools like the Data Explorer, Stack Exchange API and saving a search as a bookmark. An "advanced" workaround could be to use third-party services like Programmable Search Engine, formerly known as Custom Search Engine.

I just found a related feature-request

How do I add a Filtered Question to search for questions containing content other than just tags?

Besides the mandatory tag, it only had filtering.

I will update the below text later.

Assuming that I was right regarding that, it's not possible to create a filter for questions based on the question and answer content and considering that there isn't a specific tag for what I'm looking for, in this case, for asking for a site recommendation to ask questions about application software, the workaround is to set a broad filter, i.e., all questions from Meta Stack Exchange, then use client-side (email client, RSS client) filtering features.

Other workarounds imply using other tools like the Data Explorer, Stack Exchange API and saving a search as a bookmark. An "advanced" workaround could be to use third-party services like Programmable Search Engine, formerly known as Custom Search Engine.

Sample searches

• [site-recommendation] app
  Need to refine this search to exclude
  • "job offer" like Is there a site for app development job offers?. It's closed and has two close-to-delete votes.
  • "app store approval " like Would questions about App Store approval be appropriate for SO?. It's about commercial / partnership policies.
  • "pay tax" like Where can I ask this question - Paying Tax In Multiple Countries? | Apple. Similar to the above.

Assuming that I was right regarding that it's not possible to create filter for questions based on the question and answer content and considering that there isn't a specific tag for what I'm looking for, in this case, for asking for a site recommendation to ask questions about application software, the workaround is to set a broad filter, i.e., all questions from Meta Stack Exchange, then use client-side (email client, RSS client) filtering features.

Other workarounds imply using other tools like the Data Explorer, Stack Exchange API and saving a search as a bookmark. An "advanced" workaround could be to use third-party services like Programmable Search Engine, formerly known as Custom Search Engine.

I just found a related feature-request

How do I add a Filtered Question to search for questions containing content other than just tags?

Besides the mandatory tag, it only had filtering.

I will update the below text later.

Assuming that I was right regarding that, it's not possible to create filter for questions based on the question and answer content and considering that there isn't a specific tag for what I'm looking for, in this case, for asking for a site recommendation to ask questions about application software, the workaround is to set a broad filter, i.e., all questions from Meta Stack Exchange, then use client-side (email client, RSS client) filtering features.

Other workarounds imply using other tools like the Data Explorer, Stack Exchange API and saving a search as a bookmark. An "advanced" workaround could be to use third-party services like Programmable Search Engine, formerly known as Custom Search Engine.