Option A
Merchant of record for developers.
Polar is an open-source merchant-of-record built for digital products and SaaS — handles tax, customer accounts, and entitlements.
- Founder
- Birk Jernström
- Founded
- 2023
- Team
- 1-10
- Listing
- Free (nofollow)
- Listed
- May 2026
Option B
Free solar ROI calculator for payback, IRR, NPV, and LCOE
PV Yield helps homeowners, installers, and early-stage solar investors estimate payback, generation, revenue, IRR, NPV, LCOE, losses, and sensitivity with visible assumptions. Users can start with country and city defaults, then replace assumptions with quote-specific numbers.
- Listing
- Free (nofollow)
- Listed
- Jun 2026