We’ve introduced some websites that are helpful for learning pronunciation in our Collection of Sites for Pronunciation (1) to (3).
This time, we will introduce two sites that are helpful with learning “accents” in pronunciation.

The low and high accents known as pitch accent is a characteristic of accents in Japanese. It’s different from the stress accent of English and other languages.
By learning about the characteristics of Japanese accents, you may be able to realize problems that you are having in speaking or listening.

日本語発音ラボ Japanese Pronunciation Laboratory　（Introduction article）

This is a websites for practicing Japanese pronunciation.
If you are not familiar with Japanese accents, learn about them here first, before going on to the next website.

Learn about accents from the Pitch Accent and Compound Word Accent tabs.

Start by looking at the Explanation, under Pitch Accent.

You will see Standard Japanese Accent and Akusento-kaku (accent nucleus), Akusento-gata (accent pattern) explained.

Now move on to Practice. There are three sections to practice listening.

日本語教育用アクセント辞典 -  Japanese Accent Study Website

When you want to know about accents, this is a site you can use to search.
Only the top page is available in English.
When you want to search for the accent of a word, click “かな” from the right side of the screen.

This is a useful dictionary for people who want to know how to read the accent marks, advanced learners of Japanese and teachers of Japanese.
For people who want to learn more about the basics, the site introduced first is recommended.