Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Future Internet was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 12 days and the median time to publication was 34 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Abenza, Pedro Pablo Garrido | Kuzminykh, Ievgeniia |
| Abouenour, Lahsen | Kwon, Hyun |
| Abreu, Carlos | Kyrarini, Maria |
| Acosta-Vargas, Patricia | Lacroix, Agnès |
| Adamik, Anna | Lahby, Mohamed |
| Adamski, Andrzej | Lai, Cristian |
| Agapiou, Athos | Lama Ruiz, Juan Ramón |
| Aguaded-Gómez, José Ignacio | Lazaroiu, George |
| Ahmed, Irfan | Le, Thi-Thu-Huong |
| Aich, Satyabrata | Lee, Cheng-Chi |
| Akser, Murat | Lee, Gyumyoung |
| Alani, Omar Younis | Lee, Il-Gu |
| Alexandridis, Georgios | Lee, Ki-Sun |
| Alfeo, Antonio Luca | Lee, Manhee |
| Alibakhshikenari, Mohammad | Lee, Seunghwan |
| Al-Khateeb, Haider | Lee, Tian-Fu |
| Allani, Sabri | Levi, Itamar |
| Almeida Mendes, Mateus Daniel | Li, Chen |
| Almeida, Fernando | Li, Chengqing |
| Almeida, Joao Emilio | Li, Hui |
| Alonso, Francisco | Li, Zheng (Eddie) |
| Alonso-Muñoz, Laura | Lin, Han-Yu |
| Alsharif, Mohammed H. | Lin, Tsung-Hung |
| Amado, Miguel | Lin, Yi-Bing |
| Amin, Farhan | Listanti, Marco |
| Anagnostopoulos, Marios | Liu, Yudong |
| Anandakumar, Nalla | Lo Storto, Corrado |
| Andročec, Darko | Lopes, Betina Silva |
| Anjomshoaa, Amin | López Granado, Otoniel Mario |
| Antón, Daniel | López, Helena Fernández |
| Antunes, Mário | López-Borrull, Alexandre |
| Antunes, Mário Joao Goncalves | Lopez-Martin, Manuel |
| Aparicio-Pardo, Ramon | Loskot, Pavel |
| Aquino, Antonio | Lu, Ching-Ta |
| Arai, Ayumi | Luesma, María José |
| Arnaiz-González, Álvar | Lukinac, Jasmina |
| Artiemjew, Piotr | Lupu, Ciprian |
| Aslam, Sheraz | Lytaev, Mikhail |
| Azevedo, Fábio | Madokoro, Hirokazu |
| Babič, František | Madsen, Dag Øivind |
| Bach, Mirjana Pejic | Mahmood, Adnan |
| Bagnoli, Franco | Makowski, Lukasz |
| Bakator, Mihalj | Makris, Christos |
| Balducci, Fabrizio | Malinauskas, Romualdas |
| Bankov, Dmitry | Maniou, Theodora |
| Bantimaroudis, Philemon | Manolova, Agata |
| Barbon Junior, Sylvio | Mantzaris, Alexander V. |
| Barragán-Sánchez, Raquel | Manzalini, Antonio |
| Batchkova, Idilia | Manzanares-Lopez, Pilar |
| Ben Haj Frej, Mohamed | Marco, Hector |
| Bendechache, Malika | Marinello, Francesco |
| Benítez-Andrades, Jose Alberto | Marín-Marín, José Antonio |
| Berntzen, Lasse | Marozzo, Fabrizio |
| Bolanowski, Marek | Marticorena-Sánchez, Raúl |
| Border Sánchez, Borja | Martínez Ramón, Juan Pedro |
| Borza, Diana | Martínez-García, Miguel |
| Bossaller, Jenny | Martínez-Otzeta, José María |
| Bouchouicha, Moez | Martín-Martín, Pilar |
| Bourgeois, Anu G. | Matysik-Pejas, Renata |
| Brad, Remus | Mazilescu, Crisanta-Alina |
| Bresfelean, Vasile Paul | Mazurek, Miroslaw |
| Briongos, Samira | McAndrew, Ian |
| Bures, Miroslav | Meirinhos, Manuel Floindo Alves |
| Burlea-Schiopoiu, Adriana | Mellouli, Nédra |
| Butusov, Denis | Mican, Daniel |
| Buzón-García, Olga | Michailidis, Panagiotis D. |
| Byeon, Haewon | Migallón, Héctor |
| Bylieva, Daria | Mihaescu, Cristian |
| Cáceres Reche, Pilar | Mihailescu, Marius Iulian |
| Cardoso, Jorge C. S. | Milicevic, Mario |
| Cascardi, Alessio | Minaee, Shervin |
| Castiglione, Arcangelo | Miralinaghi, Mohammad |
| Castillo-Olea, Cristian | Miranda, Jorge |
| Catak, Ferhat Ozgur | Mitra, Rangeet |
| Catalin, Dumitrescu | Mitraka, Elvira |
| Cauteruccio, Francesco | Moccozet, Laurent |
| Cenys, Antanas | Moldovanu, Simona |
| Cernian, Alexandra | Montisci, Augusto |
| Chang, Wanjung | Montoya, Oscar |
| Chaudet, Claude | Moon, Jihwan |
| Chaudhari, Meenal | Moreno Novella, Jose I. |
| Chelli, Francesco M. | Moreno-Marcos, Pedro Manuel |
| Chen, Bo | Morocho-Cayamcela, Manuel Eugenio |
| Chen, Chin-Ling | Moßgraber, Jürgen |
| Chen, Liang-Bi | Moulin, Bernard |
| Chen, Sanchuan | Moustakidis, Serafeim |
| Cheng, Chun-An | Muhamedyev, Ravil |
| Chergui, Hatim | Munawar, Hafiz Suliman |
| Chi, Po-Wen | Muñoz, Antonio |
| Chica, Jose-Maria Serrano | Muñoz-Rodríguez, José Manuel |
| Chodarev, Sergej | Nakatsu, Ryohei |
| Choudhury, Nazim | Nazari-Heris, Morteza |
| Chui, Kwok Tai | Nazarkevych, Mariia |
| Cichosz, Paweł | Nenkov, Nayden |
| Ciuc, Mihai | Nepomuceno, Thyago |
| Coelho, Igor Machado | Neves, António J. R. |
| Colomer Feliu, Jordi | Nguyen, Kien |
| Comes, Calin-Adrian | Nicolae, Mariana |
| Conde-Cespedes, Patricia | Nijdam, Niels Alexander |
| Corea, Francesco | Nikolaidis, Ioanis |
| Corti, Fabio | Nikolakis, Nikolaos |
| Costa, Manuel Filipe Pereira Cunha Martins | Nkenyereye, Lewis |
| Costa-Requena, Jose | Nobanee, Haitham |
| Cotfas, Liviu-Adrian | Novikova, Evgenia |
| Cottone, Paolo | Nowostawski, Mariusz |
| Craig, Gregory | Ntantogian, Christoforos |
| Crisp, Geoffrey | Olivetti, Elena |
| Da Silva Couto, Maria João Valente | Ortiz, Jordi |
| DaCosta, Boaventura | O’Shaughnessy, Douglas |
| Damaševičius, Robertas | Pais, Sebastião |
| D’Andreagiovanni, Fabio | Pallmann, Philip |
| Daniela, Linda | Paniagua, Francisco Javier |
| Darki, Ahmad | Parra-Arévalo, María Isabel |
| Darwish, Mohamed | Parrino, Stefano |
| David, Bertrand | Paszkiewicz, Andrzej |
| Davidrajuh, Reggie | Patil, Madhav |
| De Carvalho, Rogerio Atem | Patra, Braja Gopal |
| De Giorgi, Maria Grazia | Patrick, Hui Chi Leung |
| Dechouniotis, Dimitrios | Patsakis, Constantinos |
| Della Vedova, Marco L. | Pediaditis, Matthew |
| Delnevo, Giovanni | Peng, Zhe |
| Demertzis, Konstantinos | Pérez Fernández, Javier |
| D’Errico, Francesca | Perez-Navarro, Antoni |
| Di Mauro, Mario | Perez-Ramirez, Carlos |
| Díaz García, Antonio F. | Pescaru, Dan |
| Dick, Geoffrey N. | Petroșanu, Dana-Mihaela |
| Díez-Bedmar, María Del Consuelo | Picone, Marco |
| Dornhöfer, Mareike | Pitropakis, Nick |
| Doynikova, Elena | Podgorelec, Blaž |
| Du, Ke-Lin | Polańczyk, Andrzej |
| Dumitriu, Dan | Polap, Dawid |
| Duradoni, Mirko | Ponciano, Jean-Jacques |
| Dziechciarz, Józef | Portilla, Jorge |
| Elagin, Vasiliy | Poulose, Alwin |
| Elshaw, Mark | Przesmycki, Rafal |
| Endo, Patricia Takako | Qi, Guanqiu |
| Espelt, Ricard | Quadri, Christian |
| Esposito, Antonio | Quevedo-Blasco, Raúl |
| Fallucchi, Francesca | Ramanauskaitė, Simona |
| Farmer, Lesley | Ramella, Giuliana |
| Fascista, Alessio | Ramos-López, Darío |
| Fattahi, Jaouhar | Rawski, Mariusz |
| Fedele, Rosario | Ray, Debisree |
| Felseghi, Raluca Andreea | Recupero, Diego Reforgiato |
| Fernandes, Sandra Raquel Gonçalves | Reggio, Gianna |
| Ferreira, Ricardo | Reijsbergen, Daniël |
| Fesenmaier, Daniel R. | Reina Quintero, Antonia M. |
| Ficco, Massimo | Ren, Ju |
| Fidan, Ismail | Reyes Menéndez, Ana |
| Fiedler, Markus | Rezvani, Mohsen |
| Figueiredo, Carlos | Ribeiro, Jorge T. |
| Florea, Bogdan Cristian | Righi, Rodrigo |
| Fogli, Daniela | Robitzsch, Alexander |
| Forestiero, Agostino | Rodriguez-Artacho, Miguel |
| Gajic, Dragoljub | Rojas, Elisa |
| Galdames, Patricio A. | Romano, Diego |
| Galić, Irena | Romero, Fernando Castano |
| Gao, Hongbo | Romero-Rodríguez, José-María |
| García, Marcelo | Roveda, Loris |
| García-Magariño, Iván | Rughinis, Razvan |
| García-Martínez, Inmaculada | Ryu, Min Ho |
| Gascón, Joan-Francesc Fondevila | Saeed, Nagham |
| Gastaldo, Paolo | Saha, Sangeet |
| Ghosh, Joydev | Saia, Roberto |
| Giannakoulopoulos, Andreas | Salinas, Jesus |
| Giomelakis, Dimitrios | Sánchez, Bordel |
| Gioulekas, Fotios | Sanchez-Gomez, Jesus |
| Girolami, Michele | San-Segundo, Rubén |
| Girovský, Peter | Sarasa-Cabezuelo, Antonio |
| Giungato, Pasquale | Sarkar, Dipto |
| Glowacz, Adam | Sarraipa, João |
| Gola, Arkadiusz | Sato, Hiroyuki |
| Gomes, Eduardo | Satorres, Silvia Martínez |
| Gómez-Abajo, Pablo | Saura, José Ramón |
| Gomez-Jauregui, Valentin | Savaglio, Claudio |
| Gómez-Rodríguez, Alma | Scatá, Marialisa |
| Granda, Juan Carlos | Schoenhofer, Savina |
| Grobelna, Iwona | Schöpfel, Joachim |
| Gudelj, Anita | Sebestyen, Gheorghe |
| Guidi, Barbara | Seliya, Naeem |
| Gulmezoglu, Berk | Sengoku, Shintaro |
| Haghi, Mostafa | Seredin, Oleg |
| Hamza-Lup, Felix | Settembre-Blundo, Davide |
| Han, Congzheng | Severino, Alessandro |
| Han, Heesup | Shabbir, Syed-Abdul |
| Hanna, Pierre | Shafiq, Muhammad |
| Hasan, Syed Faraz | Sharma, Ashutosh |
| Helebrandt, Pavol | Sharma, Sachin |
| Heo, Seonyeong | Shaukat, Kamran |
| Heo, Wookjae | Shu, Kai |
| Heydari, Shahram | Sidorov, S. P. |
| Hinas, Ajmal | Silva, Edelberto Franco |
| Hirmer, Pascal | Simonson, Shawn R. |
| Ho, Danny C. K. | Singh, Rajani |
| Hoblos, Ghaleb | Sitar-Tăut, Dan-Andrei |
| Holik, Filip | Skokowski, Pawel |
| Horák, Jakub | Slater, Luke |
| Horla, Dariusz | Smahi, Abla |
| Hribernik, Karl | Smolarz, Andrzej |
| Hua, Jie | Soto, Ignacio |
| Hussain, Sajjad | Sousa Vieira, María Estrella |
| Iancu, Bogdan (Finland) | Spaanenburg, Lambert |
| Iancu, Bogdan (Romania) | Sperlì, Giancarlo |
| Ilieva, Galina | Spiliotopoulos, Dimitris |
| Infante-Moro, Juan Carlos | Spoladore, Daniele |
| Ingaldi, Manuela | Stateczny, Andrzej |
| Izquierdo-Fuente, Alberto | Stefanovič, Pavel |
| Izydorczyk, Jacek | Stella, Massimo |
| Jaf, Sardar | Strzelecki, Artur |
| Jakubowicz, Andrew | Suciu, George |
| Jamróz, Dariusz | Sudmanns, Martin |
| Jang, Gil-Jin | Sylvia IV, J. J. |
| Jelodar, Hamed | Sztangret, Izabela |
| Jeong, Dongwon | Tejedor, Santiago |
| Jiménez, Jarilyn M. Hernández | Teoh, Kung-Keat |
| Jin, Peiquan | Tilga, Henri |
| Joshi, Gyanendra P. | Tin, Pyke |
| Junior, Antonio | Tintoré, Mireia |
| Jupowicz-Ginalska, Anna | Toldinas, Jevgenijus |
| Kabir, Russell | Tomaiuolo, Michele |
| Kaczmarek, Jarosław | Tomaszek, Katarzyna |
| Kafle, Ved | Torres Vega, Maria |
| Kakanakov, Nikolay | Torres, Sergio |
| Kalatzis, Nikos | Trakadas, Panagiotis |
| Kamal, Md Abdus Samad | Tran, Gia Khanh |
| Kamariotou, Maria | Troussas, Christos |
| Kang, Dae-Ki | Tsai, Ming-Fong |
| Karamitsos, Ioannis | Tsigopoulos, Andreas D. |
| Karampatzakis, Dimitris | Tsunenori, Mine |
| Karie, Nickson M. | Uchida, Osamu |
| Karim, Ramin | Urrutia, Manuel Leon |
| Karkazis, Panagiotis | Vakhania, Nodari |
| Karkazis, Panagiotis A. | Van Hove, Leo |
| Karyotis, Vasileios | Vand, Behrang |
| Kashevnik, Alexey | Vardasca, Ricardo |
| Kaufmann, Michael | Varga, Pal |
| Kawa, Arkadiusz | Vasilateanu, Andrei |
| Kejriwal, Mayank | Vergidis, Kostas |
| Kenyeres, Martin | Verma, Chaman |
| Keogh, John G. | Véstias, Mário |
| Khan, Muhammad Ashfaq | Visconti, Paolo |
| Kim, Byung-Gyu | Vlachopoulos, Dimitrios |
| Kim, Haklae | Wang, Cheng |
| Kim, Ki-Il | Wang, Shidan |
| Klemens, Brygida | Weinberger, Markus |
| Koelmel, Bernhard | Wnęk-Gozdek, Joanna |
| Kogias, Dimitris | Wojnakowski, Marcin |
| Kolomvatsos, Kostas | Wołk, Krzysztof |
| Konys, Agnieszka | Wróbel, Krzysztof |
| Korzun, Dmitry | Wu, Liwei |
| Kosmas, Ioannis | Wu, Ning |
| Kotis, Konstantinos | Wytrębowicz, Jacek |
| Kotteti, Chandramouli | Xiao, Liangliang |
| Kotzanikolaou, Panayiotis | Xu, Hailu |
| Kou, Gang | Yang, Baijian |
| Krasuski, Kamil | Yoo, Changsok |
| Kratzke, Nane | Yousif, Jabar H. |
| Krész, Miklós | Zago, Mattia |
| Kröker, Ilja | Zalipynis, Ramon Antonio Rodriges |
| Krygier, Jaroslaw | Zarakovitis, Charilaos |
| Krzystanek, Marek | Zennaro, Marco |
| Kühl, Alexander | Zhang, Hongbo |
| Kuhn, Nicolas | Zhou, Mingliang |
| Kuladinithi, Koojana | Zia, Kashif |
| Kumara, Indika | Zlatolas, Lili Nemec |
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