JONAS HJALMARSSON · SOLO DEVELOPER · SWEDEN

I build small, sharp tools — and the sites clients ask for.

WordPress plugins, a handful of web apps and the occasional small SaaS — released under Jalma. Free where it makes sense, paid for the parts worth paying for. In between, I build and maintain websites for clients.

Plugins

Small, single-purpose plugins for WordPress and WooCommerce. Each does one thing, stays out of the way and never phones home. Most are free on WordPress.org; a few have an optional Pro.

Conditional Payment Methods  Free + Pro

Hide WooCommerce payment methods with simple rules — by cart total, item count, shipping country, customer role or cart contents. One rule is one line.

Inline Stock Editor  Free + Pro

Bulk stock management for WooCommerce — edit stock levels for many products at once without opening each one. The Pro add-on does the spreadsheet round-trip.

Category Notifications for WooCommerce  Free + Pro

Route WooCommerce stock notifications to the right people per product category. Hierarchical and variation-aware, so the right person gets the right alert.

Products

Web apps and small SaaS I run myself — most are free to start, with a paid tier when you outgrow it.

Turas  Freemium · turas.se

Booking for the things a family or team shares — a cottage, a boat, a car. No double-bookings, no group-chat chaos.

Protokollapp  Freemium · protokollapp.se

Meeting minutes for Swedish associations — structured protokoll instead of a blank Word document, sent for justering, locked to a clean PDF.

SharedWeeks  Freemium · sharedweeks.com

Share a rolling weekly schedule as a calendar others can subscribe to — shift work, custody weeks, who-has-the-kids, published once and always current.

Client work

Websites I have designed and built for clients and agencies — from personal profile sites to product and membership sites.

Karin Göransson  karingoransson.se

A crisp personal profile site for a property consultant specialising in place-development and safety — references and press, kept simple.

Hässelby-Vällingby Fastighetsägare  havafast.se

A community site for a property-owners’ association — local collaboration and safer neighbourhoods, with news and member information.

Writing

2026-08-02

Turas: a shared calendar for the things a family shares

One calendar for the thing your family shares — a cottage, a boat, a car. No double-bookings, no group-chat chaos. How and why I built it.

2026-08-02

Playing the Second World War as a timeline

A deep dive into an interactive WW2 map with 327 sourced events you can play like a timeline — built as a self-contained static site with MapLibre.

2026-08-01

Self-hosting video calls with Jitsi Meet

After self-hosting a file-share, the next obvious thing to run yourself is video calls — a high-level look at standing up your own Jitsi Meet.

Looking for the longer version — where I’ve worked, what I’ve shipped, how to reach me?