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Smart-contract security study through vulnerable challenges

Free web-security videos and capture-the-flag practice.

Henrik Karlsson's essays about thinking and relationships

Daily personal-development lessons and curated learning pathways.

IPsec and IKE VPN software with published security releases

A personal garden-writing archive with seed and growing projects

A broad course marketplace for work skills and personal interests.

A structured task manager for projects, tags, repeating dates, forecasts, and regular reviews.

Personal account records with separate budget periods and rollover controls

Combine task lists, calendar views, reminders, and focus tools in a cross-platform to-do app.

A private journal for daily entries, prompts, photos, and memories across devices.

Desktop expense records with refund trackers and batch cleanup tools

Personal accounts and shared budgets on Apple devices

A local-first personal knowledge workspace for private notes, linked objects, and databases.

Calendar budgets that show how planned spending changes future balances

Bank activity for personal cash-flow dashboards in spreadsheets

A corporate messenger with personal and group chats, channels, threads, and calls.

History-based budgets with rollover categories and one-off expense planning

A shared lead inbox with different personal and team completion actions

Beauty shopping with product sizes and unit-price comparisons

Identify fonts by visible letter features or search related designs.

An offline desktop register with budgets and optional bank feeds

Browse a long-running collection of product, print and logo mockups.

Bitcoin exchange designed around delivery to a personal wallet