I used a Google form on our wedding web site, which populates a Google Sheet (basically online Excel in Google). Not hard to set up! I also found some pre-made Google Sheets that includes templates for budget, guest list tracker, to-do list, vendor sheets (i.e. list all the photographers you have contacted and the different info about each of them), etc. I didn't end up using this much since I'm using mostly resort vendors/services, but could be really helpful for an off-resort wedding. PM me if you want more info. I can share the sheets, too. I think you need a Gmail account to access them.