Gelluithor

Tools for the screens, cameras and servers you already run.

Four open-source projects for people who look after real hardware: TVs in a lobby, a rack of NVRs, a Linux box that is slow for no clear reason. Everything runs on your own machines, installs in one command and works on a Raspberry Pi.

ProjectLooks afterLatestRuns asPlatforms
caracalone signage screen2026.10.25docker or nativeRaspberry Pi 4/5 · PC
caracal-fleetevery screen at once4.21.0docker composeamd64 · arm64
elenvarHikvision NVRs and cameras1.2.0docker composeamd64 · arm64
tirnixa Linux server0.2.01.5 MB static binaryx86_64 · aarch64

All four are GPL-3.0 and released on GitHub.

  • Self-hostedNo cloud account, no subscription. Your data stays on your server.
  • One commanddocker compose up for the web apps, a single binary for Tirnix.
  • Small hardwareBuilt for Raspberry Pi and arm64 boards as much as for x86 servers.
  • Czech and EnglishThe web interfaces speak both, with light and dark themes.

Digital signage · Raspberry Pi 4/5 and PCs

CARACAL

Turn any TV into a managed screen. A Raspberry Pi plays web pages, Grafana dashboards, images, videos and IP cameras in a fullscreen playlist. CARACAL Fleet runs dozens of those screens from one place: what they show, when they show it, and whether they are still alive.

caracal-fleet · overview
CARACAL Fleet: the overview, devices, the screen wall, a global playlist with weather and news widgets, approvals, proof of play and an emergency message on a screen
Fleet: overview, screen wall, a global playlist with widgets, proof of play and an emergency message.
  • Zero-touch install. Prepare an SD card or USB stick in Fleet, plug it in, and the screen sets itself up with your playlist.
  • Content that runs itself. Schedules by hour and weekday, items with a validity, widgets for weather, RSS, calendars and meeting rooms, PDFs and slides.
  • Know when a screen dies. Alerts by e-mail, Teams, Slack, Telegram or ntfy, a live screen wall, a map and monthly PDF reports.
  • Screens behind NAT. Each screen dials out to Fleet, so nothing on the screen network needs to be opened.
  • Ready for a team. Roles with scopes, approvals, SSO through OpenID Connect, customers for agencies, backups to S3, SFTP or Nextcloud.
Start Fleet on any Docker host
$ mkdir caracal-fleet && cd caracal-fleet
$ curl -fsSLO https://raw.githubusercontent.com/Gelluithor/Caracal-Fleet/main/compose.yml
$ docker compose up -d
CARACAL Fleet CARACAL page Fleet page

The node: CARACAL

The player on each screen. A web admin on port 8080, encrypted logins for dashboards behind a sign-in, forced dark mode for bright websites, pop-up notifications from Grafana, Uptime Kuma, Jira or GitHub, and a watchdog that restarts a player stuck on a black page. Runs on a Raspberry Pi 4 with 1 GB.

It runs on Docker, set up by Fleet from a zero-touch SD card or with one command; it also works on its own, without Fleet.

Ways to install
caracal · web admin
CARACAL web administration: the screen now, freezing an item, the playlist, the notification look and a test notification on the screen
The node's own admin: what the TV shows now, the playlist and a test notification.

Video surveillance · Hikvision NVRs, DVRs, IP cameras

Elenvar

One web page for every Hikvision recorder you look after. Live view from many NVRs in one grid, a recordings timeline you can click through, and an e-mail the moment a camera that matters goes dark. No vendor app, no port forwarding to each recorder.

elenvar · live view
Elenvar: the overview, live view from four cameras, an enlarged camera, device detail, the recordings timeline and monitoring
Live view from four cameras, the recordings timeline and monitoring of each device.
  • Live view in the browser. 1, 4, 9 or 16 tiles from any mix of recorders. H.265 cameras are converted to H.264 when the browser can't play them.
  • Recordings timeline. A day per camera with motion and alarms marked, playback from any moment, downloads straight from the NVR.
  • Health checks every minute. Cameras, disks and clock drift. Alerts by e-mail or webhook to Slack, Discord or Home Assistant, only after repeated failures.
  • Safe with old firmware and bad passwords. Falls back to FFmpeg for picky RTSP, and stops retrying before Hikvision locks the account.
  • Hardened by default. TOTP two-factor sign-in, roles, an audit log, encrypted NVR passwords that never reach the browser.
Start Elenvar
$ git clone https://github.com/Gelluithor/Elenvar.git && cd Elenvar
$ cp .env.example .env
$ docker compose pull && docker compose up -d
Elenvar on GitHub Elenvar page Release notes

Linux diagnostics · terminal UI

Tirnix

htop tells you the CPU is at 100 %. Tirnix tells you it stayed there for 30 seconds, which processes did it, what usually causes that, and which commands confirm it. Measured facts and guesses are kept apart.

tirnix · diagnostics
Tirnix: overview, processes, diagnostics with findings, history and settings in a terminal
Recorded against a synthetic load: CPU burners, a 97 % full tmpfs and 30 zombie processes.
  • Findings, not just numbers. Each one lists what was measured, possible causes and how to verify. One spike doesn't raise an alarm.
  • Finds the source. Packet drops traced to the socket, NIC ring or conntrack table; a full disk names deleted files still held open; slow leaks are flagged.
  • Honest data. Everything from /proc, /sys and statvfs. A missing source shows as n/a, never an estimate.
  • Made for servers. One 1.5 MB static binary, no root, no daemon, no telemetry. Fits in 80×24 over SSH.
Install into ~/.local/bin
$ curl -fsSL https://raw.githubusercontent.com/Gelluithor/Tirnix/main/install.sh | sh
Tirnix on GitHub Tirnix page .deb and .rpm

How they fit together

Each project stands on its own. Together they cover a typical small site: the screens in the hallway, the cameras on the walls and the servers that run it all.