Sefirat HaOmer.

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Be'er HaChaim : Sefirat HaOmer, Lag BaOmer & Shavuot (Rabbi Elimelech Biderman)

Bein Pesach L'Shavuot - Halachot U'Minhagim Hashalem

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Bnei Yisaschar Hamevuar : Iyar/Sivan/Tamuz/Av (R' Tzvi Elimelech of Dinov)

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B'Ohr HaChaim - Rabbi Chaim Aryeh Erlanger

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Chazon Ovadia - Yom Tov (Rav Ovadia Yosef)

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Etz HaTidhar - Anaf Sefirat HaOmer

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Geulat Yitzchak : Pesach Omer & Shavuot (Rabbi Yitzhak Benzecry)

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Halichot Shlomo - R' Shlomo Zalman Auerbach (Nissan - Av)

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HaMoadim ba'Halacha - Rabbi Shlomo Yosef Zevin (2 vol.)

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Hararei Kedem al Moadim - Rabbi Yosef Dov HaLevi Soloveichik: Volume #2

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Ke'Tzet HaShemesh : Sefirat HaOmer & Shavuot (2 vol.)

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Kitvei Rabbi Natan Shapira : Peirush Haggadah, VaYamodu BaOmer, Drashot HaNassi

Ma Yafu Pe'amayich - Sefirat HaOmer & Lag BaOmer

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Maayan HaMoed (6 volumes)

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Maayan HaMoed : Sefirat HaOmer, Lag BaOmer, Shavuot, Ruth

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Merapsin Igrai : Moadim (Kushiyot & Terutzim)

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Messilot b'Or HaChassidut : Moadim vol. #1

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Mi'Mishnato shel Ramchal : Pesach thru Shavuot (Rabbi Chaim Friedlander)

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Minchat Asher al Moadim : Rabbi Asher Weiss (vol. #3 - new edition)

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Moadei HaAri - Pesach Omer & Shavuot

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Otzrot HaTorah - Sefirat HaOmer, Lag BaOmer & Shavuot

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Oz VeHadar's Mishnat HaMoadim: Sefirat HaOmer, Pesach Sheni & Lag BaOmer

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Sefat HaYam - Sefirat HaOmer (Rabbi Yaakov Moshe Hillel)

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Sefer HaTodaah : Rabbi Eliyahu Kitov

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Sefirat HaOmer - Halachot U'Minhagim Hashalem

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Shaar HaKavanot with Peirush Tiv HaKavanot / Siddur HaRashash with Peirush Tiv HaRashash : SEFIRAT HaOMER (R' Rabinowitz)

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Shibchu Geulim al Pesach & Sefirat HaOmer

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Siddur Ha-AriZal - Kol Yaakov / Sefirat HaOmer (Rabbi Yaakov Koppel)

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Siddur HaRashash Yissa Bracha -Sefirat HaOmer

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Siddur HaRav Yedidyah Refael Abulafia - Kavanot HaRashash: Sefirat HaOmer