OpenBikeSharing lets you find shared bikes available in your city (more than 400 cities, 38 countries).

Select your bike network, find some stations in the list or on the map (OpenStreetMap) and you're good to go!

If your city isn't supported or something isn't working as it should, please file a bug report or send me an email.

Source code: https://github.com/bparmentier/OpenBikeSharing

At least the following networks are currently supported:

Australia
CityCycle (Brisbane), Melbourne Bike Share

Austria
Citybike Wien

Belgium
Li bia velo (Namur), Velo Antwerpen, villo (Brussels)

Canada
BIXI Toronto (Toronto), Bixi (Montreal), Capital BIXI (Ottawa)

Chile
Bike Santiago

Cyprus
EasyBike (Nicosia)

France
Bicloo (Nantes), Cristolib (Créteil), DK'Vélo (Dunkerque), IDECycle (Pau), Le vélo (Marseille), V'lille (Lille), Velam (Amiens), Velib (Paris), Velo2 (Cergy), Vél'in (Calais), Vélo Bleu (Nice), Vélo'V (Lyon), VéloCité (Besançon, Mulhouse), Vélocéa (Vannes), Vélô (Toulouse), cy'clic (Rouen), vélOstan'lib (Nancy)

Germany
Call-A-Bike

Greece
EasyBike (Irakleio, Mani, Komotini, Karditsa, Drapetsona, Didymoteicho, Kavala, Ioannina, Nafpaktos), ThessBike (Thessaloniki)

Hungary
MOL Bubi (Budapest)

Ireland
dublinbikes (Dublin)

Italy
ARbike (Arezzo), Alba, Andria, Ascoli Piceno, BICI&CO (Como), BICIamo (Cantu'), Bari in Bici, Bassano del Grappa, BiGi (Bergamo), Bici Perugia, Bici in Busto (Busto Arsizio), BiciSchio (Schio), Biella, BikeMi (Milano), Bra, Cagliari, Casalmaggiore, Chivasso, Ciclopi (Pisa), Comunita' Montana Valli dell'Ossola (Santa Maria Maggiore - Malesco - Villette), Cuneo, FRee Bike sharing (Frosinone), Fossano, GoBike (Siracusa), GoodBike (Padova), JesinBici (Jesi), Lecce, Lecco, Manerba in Bici (Manerba del Garda), Mantova, Mar e Bici (Marciana Marina), Meglio in Bici (Cernusco sul Naviglio - Pioltello - Carugate), Novara, Novi Ligure, Oderzo, Parkinbici (Ischitella – Peschici – Rodi Garganico – Vico del Gargano), Parma, Pavia in bici, Piacenza, Pinerolo, PistoiainBici (Pistoia), Pontedera, Portofino Park and Bike (Santa MargherIT Ligure - Portofino - Camogli), Prato, Reggio Emilia, Rimini, Roma'n'Bike (Roma), Saluzzo, San Donà di Piave, Savigliano, Savona, Settimo Torinese, Sondrio, Speziainbici (La Spezia), Terni, Tigullionbike (Sestri Levante - Lavagna), Tirano in Bici, Treviso, Udine, Ustica, Venezia, Vercelli, Villorba, [TO]BIKE (Torino), Mobike (Genova)

Japan
cyclocity (富山市 / Toyama)

Lithuania
Cyclocity (Vilnius)

Luxembourg
Veloh (Luxembourg)

Mexico
EcoBici (Cd de México)

Norway
Bysykkel (Lillestrøm)

Russia
Veli'k (Казань)

Slovenia
Bicikelj (Ljubljana)

Spain
Bicileon (León), Bicing (Barcelona), Bicipalma (Palma), Bizi (Zaragoza), Girocleta (Girona), Onroll (A Rúa, Albacete, Alhama de Murcia, Almuñécar, Antequera, Aranda de Duero, Aranjuez, Badajoz, Baeza, Benidorm, Blanca, Cieza, Ciudad Real, Don Benito - Villanueva, El Campello, Elche, Guadalajara, Jaén, Lalín, Las Palmas de Gran Canaria, Montilla, Mula, Novelda, O Barco, Paiporta, Palencia, Pinto, Priego de Córdoba, Puerto Lumbreras, Puertollano, Redondela, Salamanca, San Javier, San Pedro del Pinatar, Sant Joan d'Alacant, Segovia, Soria, Talavera de la Reina, Universidad de Granada, Granada, Villaquilambre, Vinaròs, Úbeda), Onroll Via Verde (Noia - Portosin - Porto do Son), SEVICI (Sevilla), Tusbic (Santander), Valenbisi (Valencia), nbici (Pamplona)

Sweden
Cyclocity (Stockholm), Göteborg

United Kingdom
Barclays Cycle Hire (London), Bike in Bath

United States
B-cycle (Austin, Boulder, Broward, Charlotte, Denver, Des Moines, Fort Worth, Greenville, Kailua, Houston, Kansas City, Madison, Nashville, San Antonio, Spartanburg), Bay Area Bike Share (San Francisco Bay Area), Bike Chattanooga, Capital BikeShare (Washington-DC), Citi Bike (New York), CoGo (Columbus), DecoBike Long Beach/Miami Beach, Divvy (Chicago), Hubway (Boston), Nice Ride (Minneapolis), Omaha B-cycle, SLC Bike Share (Salt Lake City), WE-cycle (Aspen)