Open Collective

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 pageOpenSAK
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Budget
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About
Today's Balance
$13.76
macOS Testing Hardware (Mac m...
$670
Estimated Annual Budget
$794

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
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Make a custom one-time or recurring contribution.

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+ 20
Recurring contribution
Backer

Become a backer for $5.00 per month and support us

Starts at
$5 USD / month

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Become a sponsor for $100.00 per month and support us

Starts at
$100 USD / month

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Top financial contributors

1
MJTBC Geocaching

$210 USD since Jul 2026

2
Allyn

$50 USD since Jul 2026

3
pjacklam

$50 USD since Jul 2026

4
emsch

$50 USD since Aug 2026

5
Don Rodolphos

$30 USD since Aug 2026

6
Guest

$25 USD since Jul 2026

7
Guest

$25 USD since Sep 2026

8
CheminerWill

$20 USD since Jul 2026

9
Mike Wood

$20 USD since Jul 2026

10
Joseph

$20 USD since Jul 2026

11
Guest

$20 USD since Jul 2026

12
Telemag

$20 USD since Jul 2026

13
Vyrembi

$20 USD since Jul 2026

14
Guest

$20 USD since Jul 2026

15
Ronald

$20 USD since Jul 2026

16
Hr og Fru Danmark

$15 USD since Jul 2026

17
Bert Arnold

$12 USD since Jul 2026

18
AgreeDK

$10 USD since Jul 2026

19
Kai Team

$10 USD since Jul 2026

20
Yxza

$10 USD since Jul 2026

OpenSAK is all of us

Our contributors 24

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

Guest

$20 USD

Telemag

$20 USD

Vyrembi

$20 USD

Budget

Transparent and open finances.

Monthly financial contribution to OpenSAK (backer)

Credit from Svein Øyvind to OpenSAK •

+$5.00USD
Completed
Contribution #979189
Monthly financial contribution to OpenSAK (backer)

Credit from AB Green to OpenSAK •

+$1.00USD
Completed
Contribution #966323

Purchase of a used Mac for macOS testing/signing purposes (part 2 of 2)

Category
Equipment & Hardware
from AgreeDK to OpenSAK •
-€218.99 EUR
~$246.57 USD
Approved
$
Today’s balance

$13.76 USD

Total raised

$582.12 USD

Total disbursed

$568.36 USD

Estimated annual budget

$794.00 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...
Read more
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