 If you liked
Toaru Majutsu no Index Gaiden: Toaru Kagaku no Railgun
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 ...then you might like
Darker than Black: Shikkoku no Hana
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Although the mood of both manga titles feels different, both series features espers and individuals with special abilities.
Both series involves a group of characters who are involved with events around the city that they reside in and often deals with dangers. Yet, they try to help others and solve such cases against others who uses esper powers for dangerous purposes.
Both manga series has action, super power themes, and drama.
The main protagonist in both series are also strong, independent, and devoted to what they believe in.