I've been the man behind NPOI for more than 17 years. Maintaining a project for such a long time is really tough. NPOI has reaches 100M download. It benefits a lot of enterprises and individuals.

To support me, rather than per-project licensing (which can become costly or annoying to keep track of), we offer the Open Source Maintenance Fee, which covers all current and future libraries and tools from tonyqus
.

If a particular software/package does NOT include the OSMF EULA, then you're not bound by it at all.

Open Source Maintenance Fee

Open Source Software is free, but maintaining an Open Source Project is expensive. A lot is asked of the maintainers of this project, including:

• Triage issues
• Keep build scripts working
• Update software dependencies
• Track security reports
• Produce new releases
• Tackle spam in the discussion forums and issue trackers
• Maintain signing certificates
  And many, many other chores

The Open Source Maintenance Fee is a simple and sensible way to pay for the time and effort they spend sustaining a project.

If you, your organization, or your project makes money, select the monthly payment tier that applies to the size of your organization. If not, a personal sponsorship of your chosen amount to support @tonyqus's favorite activity is also welcomed!