Works
Tools I've built, with Castor and on my own.
With Castor
Edoardo Avenia and I run Castor. We build these for ourselves first and publish them as open source.
Command line and local consolePython
Crossfeed Orchestrator
Routes AI coding work across the subscriptions you already pay for, through each vendor's own command-line tool, and supervises every run. A local console decides which models your agents may use and how freely they spend each plan.
ABCastor/crossfeed-orchestratorAI agents
MCP server and Mac panelTypeScript
Gaddi
AI agents get your open Chrome tabs and your logins, in their own tab groups, without stealing focus. By default, anything it recognises as a payment, a send, a deletion or an upload waits for your approval with Touch ID.
ABCastor/gaddiAI agents · Mac
Python libraryPython
OmniRead
A page can read cleanly and still be missing half its sections. OmniRead returns the page as Markdown with a verdict, complete, incomplete or unknown, checked against the headings and lengths the source itself declares.
ABCastor/omnireadAI agents
Skills for AI coding toolsJavaScript
Melzi
Our fork of Impeccable. It gives a coding agent the words to critique an interface, typography, layout, colour, motion, and a detector for the patterns that make generated pages look alike.
ABCastor/melziAI agents · Design
Command lineTypeScript
SheetOps
Reads ranges, previews each change as a patch, copies a Drive backup and only then writes through Google's own APIs. Handles the Apps Script behind a sheet too.
ABCastor/SheetOpsAI agents · Command line
Mac app and command linePython
Findstill
Describe a picture, then narrow it down by people, places or dates. Runs locally on Apple Silicon against one Photos library. Experimental.
Command line and agent skillsPython
VerifyLab
Keeps formal and computational research in plain files in Git, built for agents working in parallel. A result is marked verified only after a check that anyone can re-run.
ABCastor/verifylabAI agents · Command line
On my own
Local serverTypeScriptNot public yet
Crossfeed Chat
Lets your local agents ask your ChatGPT subscription for answers, and lets your own ChatGPT chats use tools on your Mac. ChatGPT's chat limits are separate from the API and from Codex, so the subscription you already have does more work. It pairs with Crossfeed Orchestrator.
Not public yetAI agents · Mac
Mac appPython
GarminBridge
Garmin's sync is push-only, so the watch fills up with stale routes and old copies. GarminBridge talks to the watch over USB and shows where every route, workout and voice note actually lives, clears what Garmin leaves behind, and pulls voice notes off.
Anneo22/garminbridgeGarmin · Mac
WebsiteAstroDesign
abcastor.com
The whole look of Castor's site is mine: the asterisk beside the name, the line in two colours, the way a link draws its line as you point at it, the sun and moon. This site borrows a few of those habits.
abcastor.comDesign
Watch appMonkey CRelease candidate
TickTick Tasks for Garmin
I wanted TickTick on my watch without paying for another subscription. It caches today's tasks and holds your ticks until it can sync. Not in the Connect IQ store yet.
Command linePythonNot public yet
garmin-cli
Sleep, training, races, any of the ninety-odd things the watch knows, pulled into a journal or a review in one line.
Not public yetGarmin · Command line
Command lineShell
publishable
Looks through the whole history for what secret scanners miss, home paths, real names, agent working notes, and splits what you can still edit from what is already past editing.
ABCastor/publishableCommand line
Command linePython
Power Compare
Two power meters on one ride rarely agree. Power Compare lines up FIT and CSV recordings on your own computer and suggests the next test when the numbers disagree.
Anneo22/power-compare-cliCommand line
Mac appSwiftFork
XM6 Control
My fork of Rui Martins's app. I added Bluetooth quality settings that wait for the headset to confirm, a small command line, and letting go of the headphones when the app sits idle so the phone can take over.
More on my GitHub
Pulled from GitHub, most recently changed first, forks left out. Castor's are at github.com/ABCastor.
- power-compare-cli Compare cycling power recordings locally from FIT and CSV, with a CLI, browser reports and repeatable diagnostic protocols · Oct 2026
- ticktick-garmin-app Free TickTick tasks on compatible Garmin watches, with safe offline-aware completion. · Oct 2026
- garminbridge Reliable Garmin-to-Mac bridge: get your watch's voice notes and activities onto your Mac automatically. Works where Android File Transfer and OpenMTP fail. · Oct 2026