You may want to try MathMagic as it comes with some free trial period.
MathMagic is basically GUI based equation editor so anybody can type equations or mathematical symbols.
As it also supports LaTeX, if you are fluent in LaTex, you can type or paste LaTeX as well.
Or if you have some MathML based contents, you can open MathML files or paste MathML expressions into MathMagic window to render it nicely.
MathMagic will help you learn TeX as well.
If you want to learn TeX, you can copy your equation as TeX so that you can see how the equation is expressed in TeX (or MathML).
If you need to insert your TeX engined generated equations into a word processor document with the baseline aligned automatically, you can bring your TeX equation into MathMagic, and then bring the equation to your word processor, because MathMagic equations are baseline-savvy.