CRM, project management, invoicing, time tracking, HR, marketing automation, uptime monitoring, and workflow automation — all in one modern application. Free to self-host. No per-user pricing. No vendor lock-in.
Released May 2026 — banking integration, German e-invoice compliance, liquidity forecasting, and a full chart library migration.
Connect to German bank accounts via FinTS/HBCI to automatically fetch account balances — live bank balance view directly inside the Invoices module.
Generate ZUGFeRD-compliant structured XML embedded in PDF invoices, meeting the XRechnung 3.0 profile — full German e-invoicing compliance out of the box.
A 12-month rolling cash-flow and liquidity forecast based on open invoices and recurring expenses — know your runway before it's a problem.
Full migration from ApexCharts to Apache ECharts — unified chart components with consistent presets across every module in the application.
New app-wide full-text search modal — find any record, project, customer, or invoice instantly from anywhere without leaving your current context.
Track and audit GitLab projects linked to invoice items and companies, with an audit pipeline modal for triggering and reviewing security scan results.
Unlike bloated ERPs designed for every industry, NEXUS is laser-focused on what service-oriented companies actually use every day.
Full CRM with company profiles, contacts, relationship graphs, and geographic visualization.
Gantt planning, milestones, tasks, team allocation, and budget tracking with forecasting.
PDF generation, email delivery, recurring billing, cash flow analysis, and ML predictions.
Real-time tracking with focus categories, workload heatmaps, and automatic billing.
Vacation management, sick leave, working hours, team analytics, and employee profiles.
Prospect pipelines, workflow builder, Sankey funnels, lead segmentation, and campaign tracking.
No-code event automation with 20+ condition operators and template interpolation.
HTTP health checks with email and chat alerts — no separate tool needed.
Post-project reviews with problem/solution libraries and cross-project trend analysis.
Calendar management with native CalDAV & CardDAV — sync with any standard client.
Service and product management with groups, statistics, and variant handling.
GitLab, Mattermost, Slack, Local AI, Mantis — all wired in, not bolted on.
NEXUS gives every customer a living profile — projects, invoices, support tickets, and relationships, all in one place. Visualize your business network, track revenue per client, and never lose context.
Manage every phase of a project without switching tools. Gantt timelines, milestone tracking, team assignment with percentage allocation, budget vs. actual comparisons, and prediction accuracy metrics that help you quote better next time.
With ML-powered line item predictions, recurring billing, one-click PDF generation, and direct email delivery — getting paid has never been easier. Bank CSV import, DATEV export, and cash flow visualization round out a complete financial toolkit.
Track it in real-time, visualize it in heatmaps, and turn it into invoices automatically. NEXUS treats time as a first-class concept that feeds into invoicing, project analytics, HR workload, and revenue forecasting.
Vacation tracking, workload analysis, and team management — purpose-built for small teams. Employees can self-service their vacation requests, travel expenses, and sick notes. Managers get analytics and capacity planning.
Funnels, workflows, lead management, and campaign tracking — all included. Track prospects through your pipeline, design automated nurturing workflows, and analyze conversion funnels with beautiful Sankey charts.
Sentinels watch for events and act — no code, no cron jobs, no third-party tools. Define triggers, set conditions with 20+ operators (including change tracking), and execute commands from setting values to posting chat messages.
{{field}}, {{old.field}}
Features you won't find in any other source-available ERP.
Monitor your clients' servers without a separate tool. HTTP/HTTPS health checks, automated alerts via email and chat, check history, and uptime statistics — right where your projects live.
Every project makes the next one better. Structured post-project reviews with a shared problem & solution library, positives tracking, and trend analysis across your entire organization.
Your calendar, everywhere. NEXUS speaks CalDAV and CardDAV — sync with Thunderbird, Apple Calendar, DAVx⁵, or any standard client. Vacation days appear automatically.
First-class integrations — wired in, not bolted on.
Webhook-driven issue, note, pipeline, and push tracking linked to projects. Auto-configure webhooks.
Per-project channels, automated notifications from Sentinels, team member management.
Alternative chat platform support with channel posting and notifications.
LLM-powered code review suggestions and invoice item predictions via your own AI models.
Sync calendars and contacts with Thunderbird, Apple Calendar, DAVx⁵, and more.
Export invoices to major German accounting software formats.
Everything others lock behind feature paywalls, NEXUS includes in one package.
| Feature | NEXUS | Odoo | Dolibarr | ERPNext | Invoice Ninja |
|---|---|---|---|---|---|
| CRM & Customer Management | ✓ | ✓ | ✓ | ✓ | ✗ |
| Project Management (Gantt) | ✓ | ✓ | Basic | ✓ | Basic |
| Marketing Automation | ✓ | Paid | Email only | ✗ | ✗ |
| Visual Workflow Builder | ✓ | Paid | ✗ | ✗ | ✗ |
| Event-Driven Automation | ✓ | ✗ | ✗ | ✗ | ✗ |
| Uptime Monitoring | ✓ | ✗ | ✗ | ✗ | ✗ |
| CalDAV / CardDAV Sync | ✓ | ✗ | ✗ | ✗ | ✗ |
| ML Invoice Predictions | ✓ | ✗ | ✗ | ✗ | ✗ |
| GitLab Integration | ✓ | ✗ | ✗ | ✗ | ✗ |
| Real-Time WebSockets | ✓ | ✓ | ✗ | ✓ | ✗ |
| Dark Mode UI | ✓ | ✗ | ✗ | ✗ | ✓ |
| No Feature Paywalls | ✓ | ✗ | ✓ | ✗ | ✗ |
Built with the tools professional developers choose. No legacy frameworks, no proprietary languages.
TypeScript 5.9, standalone components, lazy-loaded modules, dark mode SCSS
PHP 8.3+, Eloquent ORM, REST API, queue system, scheduled commands
100+ migrations, 9 specialized query builders, soft deletes across all models
WebSocket-powered live updates — dashboard, time tracker, collaboration
Enterprise-grade OpenID Connect in production. Sanctum tokens for development.
Interactive visualizations — Sankey funnels, heatmaps, bar/line/area charts
NEXUS is designed for service-oriented businesses — not warehouses, not retail, not manufacturing.
Client management + project tracking + time-based billing + team workload — one tool for the whole lifecycle.
GitLab integration + uptime monitoring + support ticketing + Mattermost alerts — built for technical operations.
Time tracking + CRM + invoicing + travel expenses + marketing automation — from prospect to final bill.
Git integration + task management + Gantt planning + code review AI — manage projects the way developers think.
Lightweight setup with invoicing + project management + time tracking — no bloat, just the essentials.
Full marketing suite with funnel analytics + lead segmentation + campaign tracking — replace your separate tools.
NEXUS is source-available, self-hosted, and licensed under the BSL. For a production-ready setup, use the latest stable release tarball and start with Docker. If you want to modify or develop NEXUS yourself, clone the source repository.
Latest stable release: https://github.com/at2software/nexus-erp/releases
docker compose up -d
Source build: git clone https://github.com/at2software/nexus-erp.git