Primer3Plus
https://primer3plus.com
OligoAnalyzer3.1
http://sg.idtdna.com/calc/analyzer
Multiple Primer Analyzer
https://www.thermofisher.com/jp/ja/home/brands/thermo-scientific/molecular-biology/molecular-biology-learning-center/molecular-biology-resource-library/thermo-scientific-web-tools/multiple-primer-analyzer.html