The best alternatives to Open Source Tools Stack! are Feather, btw, and Medusa. If these 3 options don't work for you, we've listed a few more alternatives below.
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Feather is a collection of simply beautiful open source icons. Each icon is designed on a 24x24 grid with an emphasis on simplicity, consistency and readability.
Mapus is an open source tool to explore and annotate collaboratively on a map. You can draw, add markers, lines, areas, find places to go, observe other users, and much more.