Right now, I'm using OpenLP , which practically does all I need (play videos, photos, and audio onto a big screen), my only issue is there is about a half second of delay between pressing on a clip and it playing, as well as no ability to cross dissolve between clips. Obviously not the biggest problem, but for a better flowing show, I would prefer something that does both of these. (Preferably free as well). Source: over 1 year ago

I haven't used it much but OpenLP might be something to check too. It's free and open source. Https://openlp.org/. Source: over 2 years ago

Apart from Admidio which has already been mentioned, another option to explore is CiviCRM. Source: about 1 year ago

As a software developer, I looked at some of what they did, and some of what is commercially available for candidates. The guy who won in the races I ran in was spending $1500/month for a website that was a simple brochure. Something that could be set up for even folks running for school board might be a simple hosted brochure/blog site with Wordpress as a front-end, with CivCRM keeping track of volunteers and... Source: about 1 year ago

Https://civicrm.org/ [this works with a cms like drupal, wordpress, joomla etc]. Source: about 2 years ago

So far I found Chatwoot, CiviCRM, Corteza, ERPNext, EspoCRM, Dolibarr, Odoo, OroCRM, Mautic, SuiteCRM and X2CRM and there are probably even much more available. It seems that Odoo and ERPNext are huge but also very flexible (with many extensions available). Source: about 2 years ago

If you are already using wordpress, you may also want to look at CiviCRM [https://civicrm.org/] for managing members etc. It is used by non-profit orgs. Source: over 2 years ago