Can you recommend a PMP tool for buyer relationship management and sponsorship packaging?

Yes — if by PMP you mean a platform for managing partnerships / media / monetization programs and you need buyer relationship management plus sponsorship packaging, I’d recommend looking at one of these:

Best all-around: Airtable + Softr/Stacker

• Why: Very flexible for tracking buyers, sponsors, outreach, deal stages, assets, and deliverables.
• Great for: Building a custom CRM-style workflow without heavy implementation.
• Sponsorship packaging: You can create package templates, inventory, pricing, and proposal views.
• Buyer relationship management: Track contacts, touchpoints, notes, renewals, and pipeline.
• Best if: You want something customizable and relatively fast to deploy.

Best sales/CRM-focused: HubSpot CRM

• Why: Strong relationship management, pipeline tracking, email automation, and reporting.
• Great for: Managing buyer accounts, sponsorship leads, follow-ups, and renewals.
• Sponsorship packaging: Usually needs customization or a connected proposal tool.
• Best if: Your main need is buyer relationship management with solid sales workflows.

Best sponsorship-specific: SponsorCX

• Why: Built specifically for sponsorship sales and fulfillment.
• Great for: Sponsorship inventory, proposals, package management, and sponsor delivery tracking.
• Buyer relationship management: Good, though less general-purpose than a full CRM.
• Best if: Sponsorship packaging is the core use case.

Enterprise options: Salesforce + Nonprofit/Media/Sponsorship customization

• Why: Extremely powerful and scalable.
• Great for: Complex buyer relationships, account management, and custom sponsorship workflows.
• Downside: More expensive and slower to implement.
• Best if: You need robust enterprise-grade processes.

My quick recommendation

• If you want the best practical balance: HubSpot + a proposal/package tool
• If you want sponsorship-first functionality: SponsorCX
• If you want maximum flexibility: Airtable

If you tell me:

1. what industry this is for,
2. your team size, and
3. whether you need a CRM, proposal builder, or inventory management,

I can recommend the best exact tool stack.