at.fund is an alternative to:
GitHub Sponsors
GitHub Sponsors is a program for funding open-source developers and projects directly on GitHub.
Open Collective
Open Collective is a platform for communities to collect and spend money transparently for open-source projects.
Patreon
Patreon is a membership platform for creators to receive recurring funding from fans and supporters.
Ko-fi
Ko-fi is a platform for creators to receive one-time and monthly donations and sell digital products.