new publication about crystal (#2238)

8 years ago · db0c3b8bde
parent 59fb5e2735
commit db0c3b8bde
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--- a/free-programming-books.md
+++ b/free-programming-books.md
@ -26,6 +26,7 @@
 * [ColdFusion](#coldfusion)
 * [Cool](#cool)
 * [Coq](#coq)
+* [Crystal](#crystal)
 * [CUDA](#cuda)
 * [D](#d)
 * [Dart](#dart)
@ -936,6 +937,10 @@
 * [Software Foundations](http://www.cis.upenn.edu/~bcpierce/sf/)


+### Crystal
+
+*[Crystal for Rubyists.](http://www.crystalforrubyists.com)
+
 ### CUDA

 * [OpenCL Programming Guide for CUDA Architecture](http://www.nvidia.com/content/cudazone/download/OpenCL/NVIDIA_OpenCL_ProgrammingGuide.pdf) (PDF)