A convenient application for travelers!
It includes non-interactive transit maps of different cities in the world (without any additional download of maps). The app works offline (without an internet connection) and is free.
The catalog has the following urban transport maps:
Algiers Metro
Oran Tramway
Buenos Aires Underground
Yerevan Metro
Brisbane Train Network
Metro Trains Melbourne
Transperth Trains Perth
Sydney Trains Network
Vienna U-Bahn
Baku Metro
Minsk Metro
Brussels Metro (STIB/MIVB)
Charleroi Metro
Belo Horizonte Metro
Brasilia Metro
Fortaleza Metro
Porto Alegre Metro
Recife Metro
Rio de Janeiro Metro
Salvador Metro
São Paulo Metro
Teresina Metro
Sofia Metro
Calgary Ctrain
Edmonton Light Rail Transit
Montreal Metro
Toronto subway
Vancouver SkyTrain
Santiago Metro
Beijing Subway
Changchun Subway
Changsha Metro
Chengdu Metro
Chongqing Rail Transit
Dalian Metro
Dongguan Rail Transit
Foshan Metro
Fuzhou Metro
Guangzhou Metro GZ
Guiyang Metro
Hangzhou Metro
Harbin Metro
Hefei Metro
Hong Kong MTR system map
Kunming Rail Transit
Nanchang Metro
Nanjing Metro
Nanning Rail Transit
Ningbo Rail Transit
Qingdao Metro
Shanghai Metro
Shenyang Metro
Shenzhen Metro
Shijiazhuang Metro
Suzhou Rail Transit
Tianjin Metro
Wuhan Metro
Wuxi Metro
Xi'an Metro
Xiamen Metro
Zhengzhou Metro
Medellin Metro
Prague Metro
Copenhagen Metro
Santo Domingo Metro
Cairo Metro
Addis Ababa Light Rail
Helsinki Metro
Lille Metro
Lyon Metro
Marseille Metro
Paris Metro
Rennes Metro
Rouen Metro
Toulouse Metro
Tbilisi Metro
Berlin U-Bahn & S-Bahn DB
Bielefeld Stadtbahn
Bochum tramway network
Bonn tramway network
Cologne Stadtbahn
Dortmund Stadtbahn
Duisburg Stadtbahn
Dusseldorf tramway network
Essen tramway network
Frankfurt U-Bahn
Hamburg U-Bahn
Hanover Stadtbahn
Munich U-Bahn
Nuremberg U-Bahn
Stuttgart Stadtbahn
Athens Metro
BKK Budapest Metro
Namma Metro Bengaluru
Chennai Metro
Delhi Metro
Rapid Metro Gurgaon
Hyderabad Metro HMRL
Jaipur Metro
Kochi Metro
Kolkata Metro
Lucknow Metro
Mumbai Metro
Isfahan Metro
Mashhad Urban Railway
Shiraz Metro
Tabriz Metro
Tehran Metro
Brescia Metro
Catania Metro
Genoa Metro
Milan Metro
Naples Metro
Minimetro Perugia
Rome Metro
Turin Metro
Fukuoka City Subway
Astram Line Hiroshima
Kobe Municipal Subway
Kyoto Municipal Subway
Nagoya Municipal Subway
Osaka Municipal Subway
Sapporo Municipal Subway
Sendai Subway
Tokyo JR
Tokyo Subway
Yokohama Municipal Subway
Almaty Metro
Rapid KL
Guadalajara light rail system
Mexico City Metro (cdmx metro)
Monterrey Metro
Amsterdam Metro
Hague Tram
Rotterdam Metro
Auckland Rail Network
Pyongyang Metro
Oslo Metro
Panama Metro
Lima Metro
Manila Metro and LRTS
Warsaw Metro
Lisbon Metro
Porto Metro
Bucharest Metro
Kazan Metro
Moscow Metro
Nizhny Novgorod Metro
Novosibirsk Metro
Saint Petersburg Metro
Samara Metro
Volgograd Metrotram
Yekaterinburg Metro
Al Mashaaer Al Mugaddassah, Metro Southern Line Mecca
Mass Rapid Transit Singapore (SMRT Journeys)
Johannesburg Gautrain
Busan Metro
Daegu Metro
Daejeon Metro
Gwangju Metro
Incheon Subway
Seoul Subway
Alicante Metropolitan Tram
Barcelona Metro
Metro Bilbao
Madrid Metro
Metro Malaga
Metro de Palma de Mallorca
Metro Seville
Metro Valencia
Stockholm Metro
Lausanne Metro
Kaohsiung Mass Rapid Transit
Taipei Metro
Taoyuan Metro
Bangkok MRT and BTS Skytrain
Adana Metro
Ankara Metro
Antalya Trams
Bursa Bursaray and Burtram
Istanbul Metro
İzmir Metro
Dnipro Metro
Kharkiv Metro
Kiev Metro (Kyiv)
Kryvyi Rih Metrotram
Dubai Metro
Glasgow Subway
London Underground and DLR
Tyne and Wear Metro
MARTA Atlanta
Baltimore Metro Subway
MBTA Subway Boston
Buffalo Metro Rail
Chicago "L"
RTA Rapid Transit: Red Line Cleveland
New York City Subway (nyc subway)
Newark Light Rail and City Subway
Philadelphia SEPTA and PATCO Speedline
Pittsburgh Light Rail
San Diego MTS
BART San Francisco
Tren Urbano San Juan and Puerto Rico
Central Link Seattle
MetroLink St. Louis
Washington Metro
Tashkent Metro
Caracas Metro
Los Teques Metro
Krakow Trams
Gdansk Trams
Poznan ZTM