Advertising for Indies

Advertising is a business model for developer of open source software. There are just two steps:

Create and release your open source software as usual.
Sell advertisements in your README, documentation, project websites, and other Web presences.

Advertisements may be traditional ads or ads that a specific company or individual sponsors the project.

Pros

Paid ads typically provide recurring revenue.

Does not change anything about how you develop, license, or release.

Competitive, niche market.

May irk some users, especially those with strong privacy concerns.