In a study of the ‘kibbutz’ communities and Israel, four major incentives were found for people who worked without money.
(1) - Group productivity affects the entire communities standard of living
(2) - People gain satisfaction from work they’ve chosen to do
(3) - People develop a competitive pride in working hard
(4) - People gain prestige in the community from working hard
[Kibbutz: Venture in Utopia - Melford Spiro]
In a compilation of 400 studies on cooperation, selfishness, altruism and competition in workplaces and schools. Research found a general trend that cooperative and and altruistic behaviour resulted in greater productivity, creativity, innovation and satisfaction compared to competition and selfishness, which resulted in inefficiency, anxiety, stress and less creative output. [No Contest: The Case Against Competition - Alfie Kohn] [Punished By Rewards - Alfie Kohn]
During the 1936 Spanish Revolution, entire towns and communities were able to abolish money from their lives and institute gift economies. It saw the efficient operation of telephone lines, gas lines, running water, electricity services, railroads, tram lines, street cleaning, sanitation & sewage, hospitals, schools, car factories, weapon’s factories, textile mills, orange farms, fishing ships, radio, housing and many other industries. Not only this, but overall production increased by 30-50%. [The Anarchist Collectives - Sam Dolgoff]
In Barcelona, much of the squatter movement has managed to live on less than $1 a day and have fixed up toilets, showers, floors, kitchen, lighting, windows and entire houses. They also provide free services to the community like gardens, childcare, carpentry, bike repair, computer classes, libraries, theatre groups, movie nights and language classes. If money exists as the only motivator of human beings, how is this even possible? [Anarchy Works - Peter Gelderloos]
In the ancient proto-city of Çatalhöyük, a community with 6,000 people sustained itself and fairly complex infrastructure and culture without any form of markets, currency and trade. A system of gift economy emerged and unlike other early cities there were no signs of organised religion, slavery, patriarchy or a state structure, the community was environmentally sustainable and lasted between 1,200 to 1,800 years. [The Rise of Urbanisation - Murray Bookchin]
Numerous indigenous societies have also been 'communist' in the sense that they lacked money. Such as the Hopi, Nubians and Semai.
During the Spanish Revolution, agrarian collectives had managed to end monocultural practices in farming (usually oriented around cash-crops) and practiced various forms of intercropping. Collectives also carried out researches on tree culture, organic pesticides and treating plant-based diseases. Because of this, agricultural production increased by 30-50% across Revolutionary Spain (according to Emma Goldman). [The Anarchist Collectives - Sam Dolgoff]
Indigenous communities in Papua New Guinea managed to develop one of the most complex agricultural systems in the world in a voluntary, horizontal and communist manner. This sustainable agriculture feeds many communities and uses complex forms of irrigation, soil retention and intercropping. These systems are so complex that they still aren’t entirely understood by western scientists. [Collapse: How Societies Choose to Fail or Succeed - Jared Diamond]
Indigenous communities in rural Kenya managed to create complex communal systems of irrigation, water storage and plumbing for farming and consumption. This was done using voluntary, decentralised and communist methods. The system outperformed a far more sophisticated, capitalist and hierarchical system constructed by the British during a drought in the 1960s. [The Social Organization of Water Control in the Taita Hills, Kenya - Patrick Fleuret]
Even look further at not-for-profit, open-source items online like Wikipedia and Linux to see that innovation and hard work are entirely possible without individual gain.
I'm also pretty sure there's been a lot research into innovation that shows monetary incentives lead to worse performance, and that intrinsic motivations like curiosity in a relaxed environment leads to the best results.