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Goblin and JQuiz and Katsuyou Renshuu
Some UI examples:
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Troll and Troll-tools and Goblin
Exploration into interpreters, compilers, etc. Then making use of it in another project.
Related repositories:
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iLua
Importing a C library. In this case, incorporating library's code directly into a project.
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Gd and Cgd
Importing a C library without incorporating code into a project.
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(Lua)Blink and (Swift)Blink
Warpping an existing C library.
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Komapainter
Diving into core graphics
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AppLister
Diving into obscure, poorly-documented, low-level details.