Maybe-i-do-maybe-i-dont is a project mainly written in C#, it's free.
Give the ability to do a Maybe monad type method chaining in .Net.
This allows you do chain methods in the Maybe monad.
Example:
using org.bovinegenius.maybe;
...
var x = Maybe.Do(() => Obj.Method().Property.Field.Method());
...If anything in the chain returns null, then x will be null. Otherwise, x will contain the value of the expression.
You can also precompile an expression, and call it later:
using org.bovinegenius.maybe;
...
var someValue = Maybe.Compile(() => Obj.Method().Property.Field.Method());
var x = someValue();
...