1. RyuFast floating point to string conversion
2. MiniserdeData structure serialization library with several opposite design goals from Serde
3. CxxSafe interop between Rust and C++
4. IndocIndented document literals for Rust
8. AnyhowFlexible concrete Error type built on std::error::Error
9. RustversionConditional compilation according to rustc compiler version
16. Proc Macro WorkshopLearn to write Rust procedural macros [Rust Latam conference, Montevideo Uruguay, March 2019]
21. WattRuntime for executing procedural macros as WebAssembly
24. PasteMacros for all your token pasting needs
25. TypetagSerde serializable and deserializable trait objects
26. No PanicAttribute macro to require that the compiler prove a function can't ever panic
27. ReflectCompile-time reflection API for developing robust procedural macros (proof of concept)
30. TrybuildTest harness for ui tests of compiler diagnostics
32. semverParser and evaluator for Cargo's flavor of Semantic Versioning
34. gflagsCommand line flags library that does not require a central list of all the flags
36. lalrprocProof of concept of procedural macro input parsed by LALRPOP
38. hackfnFake implementation of `std::ops::Fn` for user-defined data types
40. efgConditional compilation using boolean expression syntax, rather than any(), all(), not()
41. oqueueNon-interleaving multithreaded output queue
42. dissimilarDiff library with semantic cleanup, based on Google's diff-match-patch
43. serde-reprSerialize and deserialize C-like enum as underlying repr
47. mashupConcatenate identifiers in a macro invocation
48. ref-castSafely cast &T to &U where the struct U contains a single field of type T.
49. cargo-tallyGraph the number of crates that depend on your crate over time