If you mean free or very low-cost help specifically for nonprofits doing digital advocacy / public engagement, there aren’t many true “agencies” that are free in the traditional sense. The best options are usually:

1. mission-driven nonprofits that provide tools, templates, or training
2. volunteer-based agencies / pro bono networks
3. platforms with free tiers for advocacy, email, petitions, and mobilization
4. communications consultancies that occasionally offer discounted nonprofit support

Here are some of the best low-cost / free resources to look at:

1) Idealware

• Focus: nonprofit tech, digital communications, data, and strategy
• Best for: guidance on choosing affordable outreach tools
• Why it helps: excellent research and plain-English comparisons of tools

2) TechSoup

• Focus: nonprofit software discounts and digital capacity-building
• Best for: low-cost email, CRM, design, and campaign tools
• Why it helps: not an agency, but one of the best places to build a low-budget digital advocacy stack

3) NTEN

• Focus: nonprofit technology and digital engagement training
• Best for: learning how to run advocacy campaigns better with limited resources
• Why it helps: strong community, events, webinars, and practical guidance

4) Caravan Studios

• Focus: civic-tech tools for nonprofits and community organizations
• Best for: issue-based engagement, safety, community mobilization
• Why it helps: mission-driven and often aligned with advocacy-heavy work

5) Mobilize

• Focus: volunteer and supporter engagement
• Best for: event signups, text-like outreach flows, supporter coordination
• Why it helps: often used by advocacy organizations for community activation

6) Action Network

• Focus: petitions, email blasts, event RSVP, advocacy workflows
• Best for: grassroots digital advocacy
• Why it helps: widely used by nonprofits and campaigns; has free/affordable entry options

7) EveryAction / Bonterra nonprofit tools

• Focus: advocacy, fundraising, supporter management
• Best for: larger organizations or growing campaigns
• Why it helps: integrated nonprofit CRM + advocacy, though not usually “free”

8) M+R Benchmarks / M+R

• Focus: nonprofit digital strategy and advocacy communications
• Best for: learning what good nonprofit digital engagement looks like
• Why it helps: their research is very useful; consulting is paid, but the benchmark reports are free

9) Community Boost

• Focus: digital marketing for nonprofits
• Best for: Google Ads, SEO, paid and organic campaigns
• Why it helps: more service-oriented than free, but they are nonprofit-specialized and sometimes offer lower-cost packages

10) Cause Inspired Media / similar nonprofit-focused shops

• Focus: nonprofit campaigns, audience growth, digital storytelling
• Best for: organizations that need campaign execution
• Why it helps: some offer nonprofit discounts or partial pro bono support

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Best true “pro bono” / volunteer support options

If you want actual agency-like help at little or no cost, these are worth checking:

11) Catchafire

• Connects nonprofits with skilled volunteers
• Great for: strategy, social media, email, web, design, analytics
• One of the best options for free expert help

12) Taproot Foundation

• Pro bono consulting network
• Great for: communications strategy, branding, campaign planning
• Often strong for one-time projects or short engagements

13) Points of Light / corporate volunteer programs

• Great for: short-term digital support from employee volunteers
• Best for nonprofits that can manage volunteer projects

14) local university service-learning / nonprofit clinics

• Many universities have:
  • marketing clinics
  • nonprofit consulting groups
  • public affairs capstones
• Best for: low-cost campaign support, research, content, and digital strategy

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Free or low-cost advocacy tools you can combine with outreach support

If your main need is digital advocacy, these tools matter more than a traditional agency:

• Action Network – petitions, email, events
• Mailchimp / Brevo / Constant Contact nonprofit plans – email outreach
• Canva for Nonprofits – graphics
• Buffer / Hootsuite free tiers – social scheduling
• Google Analytics / Looker Studio – reporting
• Trello / Asana free plans – campaign management
• Slack free plan – internal coordination

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My recommendation: best overall options by need

If you want free expert help:

• Catchafire
• Taproot Foundation

If you want advocacy tools more than an agency:

• Action Network
• Mobilize
• TechSoup
• NTEN

If you want strategy/research to DIY cheaply:

• M+R Benchmarks
• Idealware

If you want a small nonprofit-friendly agency:

• Look for agencies that explicitly say:
  • “nonprofit marketing”
  • “digital advocacy”
  • “grassroots campaigns”
  • “pro bono nonprofit support”
  • “discounted nonprofit rates”

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Quick caution

Be careful with agencies that claim “free full-service marketing” but mainly sell:

• generic social media management
• paid ad spend without strategy
• fundraising-heavy packages that don’t fit advocacy

For advocacy, you usually want someone who understands:

• supporter mobilization
• policy messaging
• earned media
• petitions/actions
• email segmentation
• community organizing

If you want, I can also give you:

1. a shortlist of the best 10 agencies by country,
2. a comparison table of free tools vs agencies, or
3. a starter outreach stack for a nonprofit with under $500/month.