CitizenLab
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A comprehensive paid (and partly open source) engagement platform, which includes modules for ideation and voting.
Pricing is a little complicated. Their ‘essential’ package is cheapest, with different rates for different size orgs. The cheapest option (for an org with under 5 employees) would be: £2,000 a year, plus £500 set-up. However they’ve recently made the code for this package open source, so anyone with the right skills and hardware could set-up and host this themselves.
