OpenSAK

COLLECTIVE

Open source

python

geocaching

dekstop-app

Fiscal Host: Open Source Collective

OpenSAK is a free, cross-platform geocache management tool for Linux, Windows and macOS — a modern, open-source successor to GSAK.

This is OpenSAK's page OpenSAK

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Updates

About

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Today's Balance

$42.66

macOS Testing Hardware (Mac m...

$670

Estimated Annual Budget

$824

Contribute

Become a financial contributor.

Financial Contributions

Membership

Yearly support

Join us for $10.00 per year and support us

$10 USD / year

Latest activity by

Custom contribution

Donation

Make a custom one-time or recurring contribution.

Latest activity by

+ 22

Recurring contribution

Backer

Become a backer for $5.00 per month and support us

Starts at

$5 USD / month

Latest activity by

Recurring contribution

Sponsor

Become a sponsor for $100.00 per month and support us

Starts at

$100 USD / month

Latest activity by

Be the first one to contribute!

Top financial contributors

MJTBC Geocaching

$210 USD since Jul 2026

Allyn

$50 USD since Jul 2026

pjacklam

$50 USD since Jul 2026

emsch

$50 USD since Aug 2026

Don Rodolphos

$30 USD since Aug 2026

Guest

$25 USD since Jul 2026

Guest

$25 USD since Sep 2026

CheminerWill

$20 USD since Jul 2026

Mike Wood

$20 USD since Jul 2026

Joseph

$20 USD since Jul 2026

Hr og Fru Danmark

$20 USD since Jul 2026

Guest

$20 USD since Jul 2026

Telemag

$20 USD since Jul 2026

Vyrembi

$20 USD since Jul 2026

Guest

$20 USD since Jul 2026

Ronald

$20 USD since Jul 2026

Schatzfinder

$20 USD since Oct 2026

Bert Arnold

$12 USD since Jul 2026

AgreeDK

$10 USD since Jul 2026

Kai Team

$10 USD since Jul 2026

OpenSAK is all of us

Our contributors 26

Thank you for supporting OpenSAK.

MJTBC Geocaching

Admin

$210 USD

AgreeDK

Admin

$10 USD

Allyn

$50 USD

pjacklam

$50 USD

emsch

$50 USD

Don Rodolphos

$30 USD

Guest

$25 USD

Guest

$25 USD

CheminerWill

$20 USD

Mike Wood

$20 USD

Joseph

$20 USD

Hr og Fru Dan...

backer

$20 USD

Guest

$20 USD

Telemag

$20 USD

Budget

Transparent and open finances.

Yearly financial contribution to OpenSAK (Yearly support)

Credit from MSWeber to OpenSAK • October 11, 2026

+$10.00USD

Completed

Contribution #987398

Monthly financial contribution to OpenSAK (backer)

Credit from Hr og Fru Danmark to OpenSAK • October 11, 2026

+$5.00USD

Completed

Contribution #966241

Financial contribution to OpenSAK

Credit from Schatzfinder to OpenSAK • October 5, 2026

+$20.00USD

Completed

Contribution #985956

Today’s balance

$42.66 USD

Total raised

$611.02 USD

Total disbursed

$568.36 USD

Estimated annual budget

$824.00 USD

Connect

Let’s get the ball rolling!

News from OpenSAK

Updates on our activities and progress.

Windows code signing plan change

Hi everyone, A quick transparency update on how your contributions to OpenSAK are being used. When we set up the "Code Signing (Windows & macOS)" budget, the plan was to buy both an Apple Developer Program membership (~$99/year) and a p...

Published on September 13, 2026 by AgreeDK

About

OpenSAK — Open Source Swiss Army Knife for Geocachers

OpenSAK is a free, open-source geocache management application built as a modern, cross-platform successor to GSAK. It runs natively on Linux, Windows, and macOS, giving geocachers a powerful tool to organize, filter, and explore their caches without being tied to a single operating system.

With OpenSAK you can import Pocket Queries and GPX files, manage multiple independent databases, filter your caches with a flexible rules engine, browse an interactive map, and export directly to Garmin GPS devices — all through a clean, translated interface available in 8 languages.

OpenSAK is built entirely by volunteers in their spare time, for the love of the hobby and the community around it. Your support through Open Collective goes directly toward keeping the project sustainable: covering costs like code signing certificates for Windows and macOS (so the app installs smoothly and safely on every platform) and other infrastructure needed to keep releases flowing.

Whether you're a long-time GSAK user looking for a modern alternative, or new to organizing your geocaching adventures, OpenSAK is built for you — and built with you, through feedback, translations, and testing from our growing community.

Thank you for supporting open-source geocaching tools!

Our team

MJTBC Geocaching

Admin

AgreeDK

Admin