The best alternatives to Qwiki are Wikipedia, Wikiverse, and Endless. If these 3 options don't work for you, we've listed a few more alternatives below.
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General Collaboration— One inbox for all your work discussions
Turn any Spreadsheet into a API. No coding required. sheet2api supports Google Sheets or Excel Online Spreadsheets. Simply connect your spreadsheet to sheet2api and use it an API, Website CMS and more.
WikiCrawl is a pet project that attempts to describe how any two Wikipedia articles are related to one another by crawling through wiki links towards each other and extracting snippets surrounding the links in articles.