What are some good alternatives to Simulink?

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SIMULINK is a visual programing environment specially for time transient simulations and ordinary differential equations. Depending on what you need there are plenty of Free, Libre and Open Source Software (FLOSS) available:

• Modelica language is the most viable alternative and in my opinion it is also a superior option to MathWorks SIMULINK. There are open source implementations OpenModelica and JModelica. One of the main advantages with Modelica that you can code a multidimensional ordinary differential equation with algebraic discrete non-causal equations. With OpenModelica you may create a non-causal model right in the GUI and with JModelica you can use Python to model everything.

• If you prefer a simular environment as SIMULINK, xcos which comes with Scilab or its older sister scicos which comes packed with Scicoslab might be very helpful. There are also the simport, Simelica-AdvancedBlocks and Coselica tools which can translate SIMULINK into scicos / Modelica models. Nelson is also a fork of Scilab which is working on a block-diagram environment (here). 

• There is also the Kepler project which is a less known but very interesting alternative.
• If you you want to simulate electrical systems then I would suggest to take a look at SimulIDE, KTechLab, QUCS/QUCS-S.

• I see some people have suggested LabVIEW as an alternative to SIMULINK, which IMHO is comparing apples and oranges. LabVIEW is a completely different beast and a great FLOSS alternative to it is MyOpenLab. You may use MyOpenLab for creating GUIs to communicate with Raspberry Pi and Arduino.