Open source

Feature for Java Platform made easy

Become a contributor

Financial contributions

Custom contribution


Make a custom one time or recurring contribution to support this collective.

1 individual has contributed

Recurring contribution


Become a backer for $5.00 per month and help us sustain our activities!

$5 USD / month

Recurring contribution


Become a sponsor for $100.00 per month and help us sustain our activities!

$100 USD / month

Top financial contributors



$100 USD since Jan 2018


See how money openly circulates through ff4j. All contributions and all expenses are published in our transparent public ledger. Learn who is donating, how much, where is that money going, submit expenses, get reimbursed and more!

Cédrick Lunven | 1/24/2018 | View Details 

Financial contribution to ff4j

shoito | 1/4/2018 | View Details 

Today’s balance

-$0.11 USD

Estimated annual budget

~ $0.00 USD

ff4j is all of us

Our contributors 22

Everyone who has supported ff4j. Individuals and organizations that believe in –and take ownership of– our purpose.

Cédrick Lunven
Collective Admin
Mabrouk Belhout
Core Contributor
George Kankava
Core Contributor
Collective Admin
Paul Williams
Collective Admin
Harry Martland
Core Contributor
Felipe Adorno
Collective Admin
Christoph Kut...
Core Contributor
Benjamin Ihrig
Core Contributor
André Blaszczyk
Collective Admin
Andrew Clemons
Core Contributor
Hans Schulz
Core Contributor


FF4j is an implementation of Feature Toggle pattern : Enable and disable features or your applications at runtime thanks to dedicated web console, REST API, JMX or even CLI. It handle also properties and provide generic interfaces.