GTM stack: guides & tutorials

TL;DR

• One docker-compose.yml: Cal.com + Chatwoot + Twenty CRM + shared PostgreSQL + Redis + Caddy
• Measured idle RAM: ~3.2 GB; peak: ~4.5 GB
• Minimum Liquid Web tier: 8 GB Managed VPS (~$33–$40/mo)
• Calendly Teams + Intercom Starter + Salesforce Essentials: ~$80+/user/mo; this stack: ~$30/mo flat

Most growth-stage teams stitch together Calendly for scheduling, Intercom for support chat, and Salesforce for pipeline — then pay Zapier to connect them. This guide deploys the open-source equivalents on a single VPS: Cal.com handles scheduling, Chatwoot handles conversations, and Twenty CRM tracks deals. When a prospect books a call, that event flows through the entire pipeline automatically.

TL;DR

• One docker-compose.yml: Twenty CRM + Mautic + Chatwoot + PostgreSQL + MariaDB + Redis + Caddy
• Measured idle RAM: ~3.0 GB; peak: ~4.5 GB on a 16 GB VPS
• Minimum Liquid Web tier: 16 GB Managed VPS (~$30/mo)
• HubSpot Marketing Hub Pro + CRM + Service Hub Pro: $800–$1,340+/mo; this stack: ~$30/mo

HubSpot charges separately for CRM, marketing automation, and customer support — and the Professional tier alone runs $800/mo before seat costs. This guide deploys all three functions with open-source equivalents: Twenty CRM for pipeline management, Mautic for email marketing and lead scoring, and Chatwoot for multi-channel support — on a single Liquid Web 16 GB VPS using one Compose file.

TL;DR

• One docker-compose.yml: Billionmail (SMTP) + Mautic (automation) + PostgreSQL + MariaDB + Caddy
• Measured idle RAM: 2.0 GB; peak: 3.6 GB (5k campaign + 500 emails/hr SMTP queue)
• Requires a 16 GB VPS with a dedicated IP — Mautic alone needs 8 GB; adding Billionmail needs the extra headroom
• Read the sustainability flags for both tools before committing: Billionmail is early-stage; Mautic has a documented 2026 funding crisis
• Mailgun Flex + ActiveCampaign Plus (10k contacts): ~$110/mo; this stack: ~$40–$55/mo on Liquid Web

This guide pairs Billionmail (self-hosted SMTP server) with Mautic (marketing automation) on a single Liquid Web 16 GB VPS. Mautic handles contact segmentation, campaign flows, landing pages, and lead scoring. Billionmail provides the SMTP relay that Mautic sends through.

TL;DR

• One docker-compose.yml: Twenty CRM + Chatwoot + shared PostgreSQL + Redis + Caddy
• Measured idle RAM: 2.2 GB; peak: 3.4 GB (20 concurrent Chatwoot conversations + 5k Twenty contact load)
• Minimum Liquid Web tier: 8 GB Managed VPS (~$33–$40/mo)
• HubSpot Sales + Service Hub Pro (5 seats): ~$1,335/mo; this stack: ~$33/mo

HubSpot bundles CRM and customer support into one product at a significant price. This guide deploys the open-source equivalents — Twenty CRM for pipeline management and Chatwoot for multi-channel customer support — on a single Liquid Web 8 GB VPS using a single Compose file.