NEXUS

NEXUS is a source-available business suite designed specifically for service teams and service-oriented companies. It brings together a wide range of business operations functions into a single application, aiming to replace multiple tools with an integrated platform focused on daily needs rather than industry-wide bloat. The suite is BSL licensed, free to self-host, and does not charge per user, eliminating vendor lock-in concerns.

The platform includes modules for customer relationship management (CRM), project management, invoicing, time tracking, human resources, marketing automation, uptime monitoring, and workflow automation. Its CRM provides company and contact profiles, relationship graphs, geographic visualization, revenue analytics, and segmentation. Project management capabilities feature Gantt planning, milestone tracking, team allocation with percentage-based assignments, budget tracking with forecasting, quote generation, and integration with tools like GitLab, Mattermost, and Mantis. The invoicing module supports ML-powered predictions for line items, recurring billing, professional PDF generation, email delivery, cash flow analysis, bank CSV import, DATEV export, and payment reminders. Time tracking is handled with real-time timers, focus categories, workload heatmaps, idle detection, and direct links to invoice generation.

HR and people management features include vacation and sick leave tracking, working time configuration, employment history, and team analytics. Marketing automation offers prospect pipelines, workflow builders, lead segmentation, campaign tracking, and no-code event automation with various condition operators. Uptime monitoring is built in, providing HTTP health checks with email and chat alerts. Additional features include post-project debriefing, calendar management with CalDAV and CardDAV sync, product catalog management, and integrations with platforms such as GitLab, Mattermost, Slack, Local AI, and Mantis.

NEXUS also supports banking integration via FinTS/HBCI for connecting to German bank accounts, enabling live balance views within the invoicing module. It offers compliance with German e-invoicing standards (ZUGFeRD and XRechnung), a 12-month liquidity forecast based on open invoices and expenses, and unified charting via Apache ECharts. The platform provides a global full-text search, GitLab audit pipelines, and a range of analytics and automation features tailored for service businesses.