A comprehensive engagement platform - it features an ‘ideas wall’, a detailed map for plotting ideas, and simple or knapsack style PB voting.

Your Priorities is an open source online idea generation, deliberation & decision-making social networking platform

D21, is a participatory budgeting platform, formerly Democracy 2.1, is a voting system for PB

A comprehensive paid (and partly open source) engagement platform, which includes modules for ideation and voting.

Participare is a tool which provides a do-it-yourself like participatory budgeting platform with idea generation, commenting and voting functionalities.

DecidM is free open source tool, meaning anyone with the right skills can freely use

Consul is an open source tool, meaning anyone with the right skills and hardware (server) can freely use and adapt the code to set this up themselves.